Lens driving apparatus, and camera module and optical device comprising same

ABSTRACT

An embodiment comprises: a housing; a bobbin for mounting a lens, the bobbin being accommodated inside the housing; a first coil disposed on an outer circumferential surface of the bobbin; a magnet disposed in the housing; and a second coil disposed in the housing, wherein the second coil comprises a third coil and a fourth coil, a first signal is applied to the first coil, a second signal is applied to the fourth coil, and an induction voltage is generated in the second coil by a mutual induction operation between the first coil and the second coil.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/758,670, filed Mar. 8, 2018; which is the U.S. national stageapplication of International Patent Application No. PCT/KR2016/010088,filed Sep. 8, 2016, which claims priority to Korean Application Nos.10-2015-0127252, filed Sep. 8, 2015, and 10-2015-0134327, filed Sep. 23,2015, the disclosures of each of which are incorporated herein byreference in their entirety.

TECHNICAL FIELD

Embodiments relate to a lens driving apparatus and to a camera moduleand an optical device including the same.

BACKGROUND ART

Cellular phones or smartphones equipped with camera modules forcapturing subjects and storing the captured subjects as images or videohave been developed. In general, a camera module may include a lens, animage sensor module, and a voice coil motor (VCM) for adjusting thedistance between the lens and the image sensor module.

In the case of a camera module mounted in a small electronic productsuch as a smartphone, the camera module may frequently receive shocksduring use, and may be shaken minutely due to, for example, shaking ofthe user's hand. In consideration of this, development of technology inwhich a hand tremor compensation device is additionally provided to thecamera module has recently been required.

DISCLOSURE Technical Problem

Embodiments provide a lens driving apparatus capable of achievingaccurate auto focusing by inhibiting a lens from being defocused due tovariation in ambient temperature, and a camera module and an opticaldevice including the same.

Technical Solution

In one embodiment, a lens driving apparatus includes a housing, a bobbinaccommodated in the housing, the bobbin being equipped with a lens, afirst coil disposed on an outer circumferential surface of the bobbin, amagnet disposed in the housing, and a second coil disposed in thehousing, wherein the second coil includes a third coil and a fourthcoil, the first coil receives a first signal and the fourth coilreceives a second signal, and induced voltage is generated at the secondcoil by mutual induction with the first coil.

Voltage may be generated at the fourth coil by the second signal.

Each of the third coil and the fourth coil may surround the outercircumferential surface of the housing so as to rotate about an opticalaxis in the clockwise direction or in the counterclockwise direction.

One of the third coil and the fourth coil may surround the outercircumferential surface of the housing so as to rotate about an opticalaxis in the clockwise direction or in the counterclockwise direction,and the remaining one of the third coil and the fourth coil may bedisposed in a shape of a coil ring that is wound about an axisperpendicular to the optical axis in the clockwise direction or in thecounterclockwise direction.

Each of the first signal and the second signal may be one of analternating-current signal and a pulse signal.

Each of the first signal and the second signal may include a pulse widthmodulation (PWM) signal.

The third coil and the fourth coil may be connected in series to eachother, and an intermediate tap may be provided at a contact pointbetween one end of the third coil and one end of the fourth coil.

The third coil and the fourth coil may be electrically separated fromeach other.

The intermediate tap may receive ground power.

The lens driving apparatus may further include an upper elastic membercoupled to an upper portion of the bobbin and an upper portion of thehousing, and a lower elastic member coupled to a lower portion of thebobbin and a lower portion of the housing, wherein each of the upperelastic member and the lower elastic member may be divided into two ormore parts, the first coil may be electrically connected to two selectedfrom among the divided parts of the upper elastic member, and the secondcoil may be electrically connected to at least three selected from amongparts of the upper elastic member other than the selected parts of theupper elastic member and among the parts of the lower elastic member.

The lens driving apparatus may further include a circuit board disposedon one side surface of the housing and electrically connected to thedivided parts of the upper elastic member and the divided parts of thelower elastic member.

The lens driving apparatus may further include a circuit board disposedbelow the lower elastic member and electrically connected to the dividedparts of the upper elastic member and the divided parts of the lowerelastic member, and support members for electrically connecting thedivided parts of the upper elastic member and the circuit board to eachother.

The lens driving apparatus may further include a fifth coil disposed onthe circuit board and configured to move the housing via interactionwith the magnet.

The lens driving apparatus may further include a capacitor connected inparallel to both ends of the second coil.

Induced voltage generated at each of the third coil and the fourth coilby mutual induction with the first coil may vary according to variationin ambient temperature.

Voltage generated by the second signal may vary according to variationin ambient temperature.

Each of the first signal and the second signal may include analternating-current signal and a direct-current signal.

The PWM signal may have a frequency of 20 kHz or higher.

In another embodiment, a camera module includes a lens barrel, a lensdriving apparatus according to the above-described embodiment for movingthe lens barrel, an image sensor for converting an image incidentthrough the lens driving apparatus into an electrical signal, and adrive controller for controlling the lens driving apparatus.

In a further embodiment, an optical device includes a display moduleincluding a plurality of pixels, colors of which are changed accordingto an electrical signal, a camera module according to claim 19 forconverting an image incident thereon into an electrical signal, and acontroller for controlling operation of the display module and thecamera module.

Advantageous Effects

Embodiments are capable of achieving accurate auto focusing byinhibiting a lens from being defocused due to variation in ambienttemperature.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a perspective view of a lens driving apparatusaccording to an embodiment.

FIG. 2 is an exploded perspective view of the lens driving apparatusshown in FIG. 1.

FIG. 3 illustrates a schematic exploded perspective view of a housing, amagnet, and a circuit board shown in FIG. 1.

FIG. 4 illustrates an assembled perspective view of the housing, themagnet, and the circuit board of FIG. 3.

FIG. 5 illustrates a bobbin, an upper elastic member, and the circuitboard shown in FIG. 1.

FIG. 6 illustrates the bobbin and a lower elastic member shown in FIG.1.

FIG. 7 illustrates one embodiment of a second coil disposed in thehousing.

FIG. 8 illustrates another embodiment of the second coil disposed in thehousing.

FIG. 9a illustrates one embodiment of the second coil shown in FIG. 1.

FIG. 9b illustrates another embodiment of the second coil shown in FIG.1.

FIG. 10a illustrates first voltage between one end of a first inductioncoil and an intermediate tap and second voltage between one end of asecond induction coil and the intermediate tap, which are shown in FIG.9 a.

FIG. 10b illustrates first voltage between one end and the opposite endof a first induction coil and second voltage between one end and theopposite end of a second induction coil, which are shown in FIG. 9 b.

FIG. 11 illustrates variation in voltage, which is induced to the firstinduction coil or the second induction coil, according to ambienttemperature.

FIG. 12 illustrates a capacitor for removing PWM noise.

FIG. 13a illustrates frequency response characteristics with respect toa gain of output of the second coil according to the presence of thecapacitor.

FIG. 13b illustrates frequency response characteristics with respect toa phase of the output of the second coil according to the presence ofthe capacitor.

FIG. 14 illustrates an exploded perspective view of a lens drivingapparatus according to another embodiment.

FIG. 15 illustrates an exploded perspective view of a base, a circuitboard, and a third coil shown in FIG. 14.

FIG. 16 is an assembled perspective view of the lens driving apparatusof FIG. 14, from which a cover member is removed.

FIG. 17 is a plan view of FIG. 16.

FIG. 18 illustrates a sectional view of FIG. 17 when viewed in ABdirection.

FIG. 19 is a perspective view of the lens driving apparatus of FIG. 16,from which a bobbin and a third coil are removed.

FIG. 20 illustrates an upper elastic member, a lower elastic member, anda support member according to another embodiment.

FIG. 21a illustrates arrangement of a second coil according to anotherembodiment.

FIG. 21b illustrates a perspective view of the second coil of FIG. 21a ,from which the bobbin and a first induction coil are removed.

FIG. 22 shows first induced voltage of the first induction coilaccording to a displacement of a movable unit when ambient temperatureis room temperature, and a code value corresponding to a displacement ofan AF movable unit.

FIG. 23 is a flowchart showing a temperature compensation method withrespect to AF feedback according to the embodiment.

FIG. 24 is a schematic perspective view of a lens driving apparatusaccording to another embodiment.

FIG. 25 is an exploded perspective view of FIG. 24.

FIG. 26 is a view of the lens driving apparatus of FIG. 24, from which acover member 2310 is removed.

FIG. 27 is a perspective view of a bobbin shown in FIG. 25.

FIG. 28 is a first perspective view of a housing shown in FIG. 25.

FIG. 29 is a second perspective view of the housing shown in FIG. 25.

FIG. 30 is a rear perspective view of the housing to which the bobbinand a lower elastic member of FIG. 25 are coupled.

FIG. 31 is a plan view illustrating an initial state of an upper elasticmember shown in FIG. 25.

FIG. 32 is a view illustrating a state in which the upper elastic memberof FIG. 25 is divided into first and second upper elastic members.

FIG. 33 is an enlarged view of portion “A” in FIG. 26.

FIGS. 34 and 35 are views illustrating a base, a circuit board, and asecond coil of FIG. 25.

FIG. 36 is a plan view illustrating the coupling structure of the secondcoil coupled to the circuit board of FIG. 25.

FIG. 37 is a view illustrating the bottom surface of the base of FIG.25.

FIG. 38 is a sectional view taken along line I-I′ in FIG. 26.

FIG. 39 is a sectional view taken along line II-IF in FIG. 26.

FIG. 40 is a sectional view taken along line in FIG. 26.

FIG. 41 is a view illustrating the constitution related to a sensingcoil of FIG. 25.

FIG. 42 illustrates an exploded perspective view of a camera moduleaccording to an embodiment.

FIG. 43 illustrates a perspective view of a mobile terminal according toan embodiment.

FIG. 44 is a view illustrating the constitution of the mobile terminalshown in FIG. 43.

BEST MODE

Hereinafter, embodiments will be clearly understood from the attacheddrawings and the description associated with the embodiments. In thedescription of the embodiments, it will be understood that when anelement, such as a layer (film), a region, a pattern or a structure, isreferred to as being “on” or “under” another element, such as asubstrate, a layer (film), a region, a pad or a pattern, the term “on”or “under” means that the element is “directly” on or under anotherelement or is “indirectly” formed such that an intervening element mayalso be present. In addition, it will also be understood that thecriteria of “on” or “under” is on the basis of the drawings.

In the drawings, elements may be exaggerated in size, omitted orschematically illustrated for convenience in description and clarity.Further, the sizes of elements do not indicate the actual sizes of theelements. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same parts.

For the convenience of description, the lens driving apparatus accordingto the embodiment will be described using a Cartesian coordinate system(x, y, z). However, the disclosure is not limited thereto. Otherdifferent coordinate systems may be used. In the drawings, an x axis anda y axis are directions perpendicular to a z axis, which is anoptical-axis direction. The optical-axis direction or the z-axisdirection, which is parallel to the optical-axis direction, may bereferred to as a ‘first direction’, the x-axis direction may be referredto as a ‘second direction’, and the y-axis direction may be referred toas a ‘third direction’.

FIG. 1 illustrates a perspective view of a lens driving apparatus 100according to an embodiment, and FIG. 2 is an exploded perspective viewof the lens driving apparatus 100 shown in FIG. 1.

A hand tremor compensation device used in a small-sized camera modulemounted in a mobile device, such as a smartphone or a tablet PC, is adevice configured to inhibit the outline of a captured image from beingblurred due to vibration caused by the shaking of a user's hand when theimage is captured. The term “hand tremor compensation” may be used alongwith “Optical Image Stabilization (OIS)”.

In addition, an auto focusing device is a device for automaticallyfocusing an image of a subject on the surface of an image sensor (notillustrated). The optical image stabilization device and the autofocusing device may be configured in various manners. The lens drivingapparatus 100 according to the embodiment may move lenses in the firstdirection in order to perform an auto focusing function.

Referring to FIGS. 1 and 2, the lens driving apparatus 100 includes abobbin 110, a first coil 120, a magnet 130, a housing 140, an upperelastic member 150, a lower elastic member 160, a second coil 170, and acircuit board 250. The lens driving apparatus 100 may further include acover member 300 and a base 210.

First, the cover member 300 will be described.

The cover member 300 accommodates the components 110, 120, 130, 140,150, 160 and 250 in an accommodation space defined by the cover member300 and the base 210.

The cover member 300 may be formed in the shape of a box, the lowerportion of which is open and which includes an upper end and sidewalls.The lower portion of the cover member 300 may be coupled to the upperportion of the base 210. The upper end of the cover member 300 may beformed in a polygonal shape, such as a quadrangular or octagonal shape.

The cover member 300 may be provided in the upper end thereof with ahollow, through which a lens (not shown) coupled to the bobbin 110 isexposed to external light. In addition, a window, made of alight-transmissive material, may be further provided in the hollow inthe cover member 300 in order to inhibit foreign matter, such as dust ormoisture, from permeating into a camera module.

The cover member 300 may be made of a non-magnetic body, such as SUS, inorder to inhibit the cover member from being attached to the magnet 130.Alternatively, the cover member 300 may be made of a magnetic body so asto perform a yoke function.

Next, the bobbin 110 will be described.

The bobbin 110 is disposed inside the housing 140. The bobbin 110 maymove in the optical-axis direction or in the first direction parallel tothe optical-axis direction (e.g. the Z-axis direction or theoptical-axis direction) as the result of electromagnetic interactionbetween the coil 120 and the magnet 130.

Although not shown, the bobbin 110 may include a lens barrel (notshown), in which at least one lens is installed. The lens barrel may becoupled to the inside of the bobbin 110 in various manners.

The bobbin 110 may have a hollow, in which the lens or the lens barrelis mounted. The shape of the hollow in the bobbin 110 may conform tothat of the lens or the lens barrel. For example, the hollow may beformed in a circular, oval, or polygonal shape. However, the disclosureis not limited thereto.

The bobbin 110 may have at least one upper support protrusion 113, whichis disposed on the upper surface thereof and is coupled and fixed to aninner frame of the upper elastic member, and at least one lower supportprotrusion (not shown), which is disposed on the lower surface thereofand is coupled and fixed to an inner frame 161 of the lower elasticmember 160.

The bobbin 110 may have an upper escape recess 112 provided in oneregion of the upper surface thereof that corresponds to or is alignedwith a connection portion 153 of the upper elastic member 150. Inaddition, the bobbin 110 may have a lower escape recess (not shown)provided in one region of the lower surface thereof that corresponds toor is aligned with a connection portion 163 of the lower elastic member150. Alternatively, in another embodiment, the connection portion of theupper elastic member and the bobbin may be designed so as to avoidinterfering with each other, in which case the upper escape recessand/or the lower escape recess may be eliminated.

The bobbin 110 may be provided in the outer circumferential surfacethereof with at least one recess (not shown), in which the first coil120 is disposed or installed. The shape and number of recesses maycorrespond to the shape and number of coils disposed on the outercircumferential surface of the bobbin 110. In another embodiment, thebobbin 110 may have no coil-receiving recess, and the first coil 120 maybe directly wound around and fixed to the outer circumferential surfaceof the bobbin 110.

Next, the first coil 120 will be described.

The first coil 120 is disposed on the outer circumferential surface ofthe bobbin 110. The first coil 120 may be a driving coil thatelectromagnetically interacts with the magnet 130 disposed in thehousing 140. In order to generate electromagnetic force using theelectromagnetic interaction with the magnet 130, a drive signal (e.g.drive current) may be applied to the first coil 120.

An AF movable unit may move in the first direction due to theelectromagnetic force generated by the electromagnetic interactionbetween the first coil 120 and the magnet 130. The movement of themovable unit in the first direction may be controlled by controlling thedrive signal applied to the first coil 120 to adjust the electromagneticforce, thereby performing an auto focusing function.

The AF movable unit may include the bobbin 110, which is elasticallysupported by the upper and lower elastic members 150 and 160, andcomponents, which are mounted to the bobbin 110 so as to move togetherwith the bobbin 110. For example, the AF movable unit may include thebobbin 110, the first coil 120, and the lens (not shown) mounted to thebobbin 110.

The first coil 120 may be wound around the outer circumferential surfaceof the bobbin 110 so as to rotate about the optical axis in theclockwise direction or in the counterclockwise direction. In anotherembodiment, the first coil 120 may be formed in the shape of a coil ringthat is wound about an axis that is perpendicular to the optical axis inthe clockwise direction or in the counterclockwise direction. The numberof coil rings may be the same as the number of magnets 130. However, thedisclosure is not limited thereto.

The first coil 120 may be electrically connected to at least one of theupper or lower elastic member 150 or 160.

Next, the housing 140 will be described.

FIG. 3 illustrates a schematic exploded perspective view of the housing140, the magnet 130, and the circuit board 250, and FIG. 4 illustratesan assembled perspective view of the housing 140, the magnet 130, andthe circuit board 250 of FIG. 3.

Referring to FIGS. 3 and 4, the housing 140 supports the magnet 130 andthe circuit board 250, and receives the bobbin 110 therein such that thebobbin 110 is movable in the first direction, which is parallel to theoptical axis.

The housing 140 may be generally formed in a hollow column shape. Forexample, the housing 140 may have four side portions 140 a to 140 d andmay have a polygonal (e.g. quadrangular or octagonal) or circular hollowtherein.

The side portions 140 a to 140 d of the housing 140 may be provided withmagnet recesses 141 a, 141 a′, 141 b, and 141 b′, in which the magnet130 is seated, disposed, or fixed. In FIG. 3, each of the magnetrecesses 141 a, 141 a′, 141 b, and 141 b′ is formed in the shape of athrough-hole. However, the disclosure is not limited thereto. Each ofthe magnet recesses may be formed in the shape of a blind hole.

The housing 140 may have a first stopper 143 protruding from the uppersurface thereof.

The first stopper 143 of the housing 140 is provided to inhibitcollisions between the cover member 300 and the housing 140. When anexternal impact is applied, the first stopper may inhibit directcollision between the upper surface of the housing 140 and the upperinner surface of the cover member 300.

In addition, the housing 140 may be provided on the upper surfacethereof, e.g. the upper surfaces of the side portions 140 a to 140 d,with a plurality of upper frame support protrusions 144, to which anouter frame 152 of the upper elastic member 150 is coupled. The housing140 may be provided on the lower surface thereof with a plurality oflower frame support protrusions 147, to which an outer frame 162 of thelower elastic member 160 is coupled.

In addition, the housing 140 may be provided in the lower ends of thecorners of the side portions 140 a to 140 d thereof with lower guiderecesses 148, into which guide members 216 of the base 210 are inserted,fastened, or coupled.

The housing 140 may be provided in the marginal regions of the uppersurface thereof, e.g. the marginal regions of the upper surfaces of theside portions 140 a to 140 d, with a seat portion 149, on which thesecond coil 170 is seated. The seat portion 149 may be located on themarginal regions of the upper surface of the housing 140 that areadjacent to the edges at which the upper surfaces and the side surfacesof the side portions 140 a to 140 d adjoin each other.

The seat portion 149 and the upper surfaces of the side portions 140 ato 140 d of the housing 140 may have steps formed in the verticaldirection or in the first direction, and the seat portion 149 may belocated below the upper surfaces of the side portions 140 a to 140 d ofthe housing 140.

The second coil 170 seated on the seat portion 149 may be spaced apartfrom the upper elastic member 150, which is located on the upper surfaceof the housing 140. The reason for this is to inhibit the second coil170 from being electrically connected to the upper elastic members (e.g.the first and second upper elastic members), which are connected withthe first coil 120.

For example, the seat portion 149 may be located between the firststopper 143 and the edges at which the upper surfaces and the sidesurfaces of the side portions 140 a to 140 d adjoin each other, and thefirst stopper 143 may guide the second coil 170 so that the second coil170 is seated on the seat portion 149.

Next, the magnet 130 will be described.

The magnet 130 may be disposed at the side portions 140 a to 140 d ofthe housing 140 so as to correspond to or be aligned with the first coil120 in a direction perpendicular to the optical-axis direction.

For example, the magnet 130 may be disposed in the magnet recesses 141a, 141 a′, 141 b, and 141 b′ in the housing 140 so as to overlap thefirst coil 120 in the second direction or in the third direction.

In another embodiment, no magnet recesses may be formed in the sideportions 140 a to 140 d of the housing 140, and the magnet 130 may bedisposed outside or inside the side portions 140 a to 140 d of thehousing 140.

The magnet 130 may have a shape corresponding to the side portions 140 ato 140 d of the housing 140, e.g. a rectangular parallelepiped shape.However, the disclosure is not limited thereto.

The magnet 130 may be a monopolar magnetized magnet or a bipolarmagnetized magnet, which is configured such that the surface of themagnet that faces the first coil 120 has an S pole and the outer surfaceof the magnet has an N pole. However, the disclosure is not limitedthereto. The polarity of the magnet may be reversed.

In this embodiment, the number of magnets 30 is four. However, thedisclosure is not limited thereto. The number of magnets 130 may be atleast two. The surface of the magnet 130 that faces the first coil 120may be flat. However, the disclosure is not limited thereto. The surfaceof the magnet that faces the first coil may be curved.

Next, the upper elastic member 150 and the lower elastic member will bedescribed.

FIG. 5 illustrates the bobbin 110, the upper elastic member 150, and thecircuit board shown in FIG. 1, and FIG. 6 illustrates the bobbin 110 andthe lower elastic member 160 shown in FIG. 1.

Referring to FIGS. 5 and 6, the upper elastic member 150 and the lowerelastic member 160 are coupled to the bobbin 110 and the housing 140,and flexibly support the bobbin 110.

For example, the upper elastic member 150 may be coupled to the upperportion, the upper surface or the upper end of the bobbin 110 and to theupper portion, the upper surface or the upper end of the housing 140,and the lower elastic member 160 may be coupled to the lower portion,the lower surface or the lower end of the bobbin 110 and to the lowerportion, the lower surface or the lower end of the housing 140.

At least one of the upper and lower elastic members 150 and 160 may bedivided into two or more parts.

For example, the upper elastic member 150 may include first to fourthupper elastic members 150 a to 150 d, which are separated from eachother, and the lower elastic member 160 may include first and secondlower elastic members 160 a and 160 b, which are separated from eachother. The upper elastic member 150 and the lower elastic member 160 mayeach be embodied by a leaf spring. However, the disclosure is notlimited thereto. The upper elastic member and the lower elastic membermay each be embodied by a coil spring or a suspension wire.

Each of the first to fourth upper elastic members 150 a to 150 d mayinclude an inner frame 151 coupled to the upper support protrusions 113of the bobbin 110, an outer frame 152 coupled to the upper frame supportprotrusions 144 of the housing 140, and a first connection portion 153for connecting the inner frame 151 and the outer frame 152 to eachother.

Each of the first and second lower elastic members 160 a and 160 b mayinclude an inner frame 161 coupled to the lower support protrusion ofthe bobbin 110, an outer frame 162 coupled to the lower frame supportprotrusions 147 of the housing 140, and a second connection portion 163for connecting the inner frame 161 and the outer frame 162 to eachother.

Each of the connection portions 153 and 163 of the upper and lowerelastic members 150 and 160 may be bent at least once to form apredetermined pattern. The upward and/or downward movement of the bobbin110 in the first direction may be flexibly (or elastically) supportedthrough the positional change and micro-scale deformation of theconnection portions 153 and 163.

The inner frame 151 of the first upper elastic member 150 a may includea first inner connection portion R1, and the outer frame 152 of thefirst upper elastic member 150 a may include a first outer connectionportion Q1.

The inner frame 151 of the second upper elastic member 150 b may includea second inner connection portion R2, and the outer frame 152 of thesecond upper elastic member 150 b may include a second outer connectionportion Q2.

The inner frame 151 of the third upper elastic member 150 c may includea third inner connection portion R3, and the outer frame 152 of thethird upper elastic member 150 c may include a third outer connectionportion Q3.

The inner frame 151 of the fourth upper elastic member 150 d may includea fourth inner connection portion R4, and the outer frame 152 of thefourth upper elastic member 150 d may include a fourth outer connectionportion Q4.

The inner frame 161 of the first lower elastic member 160 a may includea fifth inner connection portion R5, and the outer frame 162 of thefirst lower elastic member 160 a may include a fifth outer connectionportion Q5.

The inner frame 161 of the second lower elastic member 160 b may includea sixth inner connection portion R6, and the outer frame 162 of thesecond lower elastic member 160 b may include a sixth outer connectionportion Q6.

The first to sixth inner connection portions R1 to R6 may be parts towhich the first coil 120 or the second coil 170 is electricallyconnected, and the first to sixth outer connection portions Q1 to Q6 maybe parts to which the circuit board 250 is electrically connected.

The first coil 120 may be electrically connected to two inner connectionportions selected from among the first to sixth inner connectionportions R1 to R6. In addition, the second coil 170 may be electricallyconnected to inner connection portions other than the inner connectionportions to which the first coil 120 is connected.

For example, one end of the first coil 120 (e.g. the start portion ofthe first coil 120) may be electrically connected to the first innerconnection portion R1, and the opposite end of the first coil 120 (e.g.the end portion of the first coil 120) may be electrically connected tothe second inner connection portion R2.

Depending on the configuration, the second coil 170 may include threeterminals 22 a, 22 b and 22 c or four terminals 23 a, 23 b, 24 a and 24b. Each of the terminals of the second coil 170 may be electricallyconnected to a corresponding one of the third to fourth inner connectionportions R3 to R6.

The first to sixth outer connection portions Q1 to Q6 may beelectrically connected to the circuit board 250. For example, each ofthe first to sixth outer connection portions Q1 to Q6 may beelectrically connected to a corresponding one of terminals 251-1 to251-6 of the circuit board 250.

Bonding between the first coil 120 and the first and second innerconnection portions R1 and R2, between the second coil 170 and the thirdand fourth inner connection portions R3 and R4, and between the circuitboard 250 and the first to sixth outer connection portions Q1 to Q6 maybe achieved by thermal fusion such as soldering or using conductiveepoxy (e.g. Ag epoxy).

The first to fourth upper elastic members 150 a to 150 d may havethrough-holes or recesses 151 a, which are formed in the inner frames151 and are coupled to the upper support protrusions 113 of the bobbin110, and through-holes or recesses 152 a, which are formed in the outerframes 152 and are coupled to the upper frame support protrusions 144 ofthe housing 140.

In addition, the first and second lower elastic members 160 a and 160 bmay have through-holes or recesses 161 a, which are formed in the innerframes 161 and are coupled to the lower support protrusions of thebobbin 110, and through-holes or recesses 162 a, which are formed in theouter frames 162 and are coupled to the lower frame support protrusionsof the housing 140.

Bonding between the upper and lower elastic members 150 and 160 and thebobbin 110 and between the upper and lower elastic members 150 and 160and the housing 140 may be achieved by thermal fusion and/or using anadhesive.

Next, the circuit board 250 will be described.

The circuit board 250 may be disposed at, coupled to, or mounted to thehousing 140, and may be electrically connected to at least one of theupper or lower elastic members 150 or 160. The circuit board 250 may bea printed circuit board, e.g. a FPCB, a PCB, or a ceramic board.

For example, the circuit board 250 may be fixed to, supported by, ordisposed at one (e.g. 140 c) of the four side portions 140 a to 140 d ofthe housing 140. However, the disclosure is not limited thereto. Inanother embodiment, the circuit board 250 may be supported by the uppersurface of the housing 140.

The circuit board 250 may have a plurality of terminals 251, which areelectrically connected to the first coil 120 and the second coil 170.

Through the terminals of the circuit board 250, a first drive signal maybe supplied to the first coil 120, first voltage v1 or v1″ of a firstinduction coil 171 may be output, and a second drive signal Id2 may besupplied to a second induction coil 172.

For example, the circuit board 250 may include two terminals 251-1 and251-2 for supplying first power (e.g. (+) power) and second power (e.g.(−) power) to the first coil 120, terminals 251-3 and 251-4, throughwhich the voltage of the first induction coil 171 is output, andterminals 251-5 and 251-6 for supplying the second drive signal to thesecond induction coil 172.

The lens driving apparatus 100 may include a driver IC, which providesthe first drive signal Id1 and the second drive signal Id2 and isdisposed on the circuit board 250 or a circuit board 1250, to bedescribed later. Alternatively, in another embodiment, the driver IC maybe provided at the camera module.

Next, the base 210 will be described.

The base 210 may be coupled to the cover member 300 to define a spacefor receiving the bobbin 110 and the housing 140. The base 210 may havea hollow corresponding to the hollow in the bobbin 110 and/or the hollowin the housing 140, and may be formed in a shape coinciding with orcorresponding to the shape of the cover member 300, such as aquadrangular shape.

The base 210 may include guide members 216 protruding upwardsperpendicularly from the four corners thereof by a predetermined height.Each of the guide members 216 may be formed in the shape of amulti-angular prism. However, the disclosure is not limited thereto. Theguide members 216 may be inserted, fastened, or coupled into the lowerguide recesses 148 in the housing 140.

Next, the second coil 170 will be described.

The second coil 170 is disposed in the housing 140 so as to be spacedapart from the first coil 120.

For example, the second coil 170 may be disposed on the seat portion 149provided in the housing 140. For example, the second coil 170 disposedon the seat portion 149 may be disposed between the upper elastic member150 and the first coil 120 in the vertical direction or in the firstdirection. However, the disclosure is not limited thereto.

The second coil 170 may be wound so as to rotate about the optical axisin the clockwise direction or in the counterclockwise direction.However, the disclosure is not limited thereto. The second coil 170 maycorrespond to or may be aligned with the first coil 120 in the firstdirection. However, the disclosure is not limited thereto.

As shown in FIG. 3, the second coil 170 is formed in the shape of aring. However, the disclosure is not limited thereto. The second coil170 may be formed in the shape of a PCB or an FP coil.

FIG. 7 illustrates one embodiment of the second coil 170 disposed in thehousing 140.

Referring to FIG. 7, the second coil 170 includes a first induction coil171 and a second induction coil 172.

Each of the first induction coil 171 and the second induction coil 172may be wound around the outer circumferential surface of the housing 140so as to rotate about the optical axis in the clockwise direction or inthe counterclockwise direction.

The first induction coil 171 may be a coil for sensing the position ordisplacement of the movable unit, namely the bobbin 110, and the secondinduction coil 172 may be a coil for sensing variation in ambienttemperature. For example, the ambient temperature may be a temperaturethat is generated when the lens driving apparatus, the camera module orthe mobile phone is used, and that is applied to the second coil 170.

The first induction coil 171 and the second induction coil 172 may bedisposed so as to surround the outer circumferential surface, namely theside portions 140 a to 140 d, of the housing 140 so as to rotate aboutthe optical axis in the clockwise direction or in the counterclockwisedirection. The first induction coil 171 and the second induction coil172 may be disposed adjacent to each other.

FIG. 8 illustrates another embodiment 170 a of the second coil 170disposed in the housing 140.

Referring to FIG. 8, the second coil 170 may include a first inductioncoil 171 disposed at the upper portion of the outer circumferentialsurface of the housing 140 and a second induction coil 172 disposedbelow the first induction coil 171 so as to be spaced apart therefrom.

At least one of the first and second induction coils 171 and 172 may bedisposed so as to surround the outer surface of the housing 140 so as torotate about the optical axis in the clockwise direction or in thecounterclockwise direction.

In addition, at least one of the first and second induction coils 171and 172 may be disposed in the shape of a coil ring that is wound aroundone of the side portions of the housing 140 about an axis perpendicularto the optical axis in the clockwise direction or in thecounterclockwise direction.

For example, the first induction coil 171 may be disposed so as tosurround the outer surface of the housing 140 so as to rotate about theoptical axis in the clockwise direction or in the counterclockwisedirection, and the second induction coil 172 may be disposed in theshape of a coil ring that is wound around one of the side portions ofthe housing 140 about an axis perpendicular to the optical axis in theclockwise direction or in the counterclockwise direction.

FIG. 9a illustrates one embodiment 170-1 of the second coil 170 shown inFIG. 1.

Referring to FIG. 9a , the second coil 170 includes a first inductioncoil 171 and a second induction coil 172, which are connected to eachother in series, and an intermediate tap 22 c, which is connected to acontact point N1 between the first induction coil 171 and the secondinduction coil 172.

The circuit board 250 may include three terminals for electricconnection with one end 22 a of the first induction coil 171, one end 22b of the second induction coil 172, and the intermediate tap 22 c.

FIG. 9b illustrates another embodiment 170-2 of the second coil 170shown in FIG. 1.

Referring to FIG. 9b , the second coil 170-2 may include a firstinduction coil 171 and a second induction coil 172, which areelectrically separated from each other.

The circuit board 250 may include four terminals for electric connectionwith one end 23 a and the opposite end 23 b of the first induction coil171 and one end 24 a and the opposite end 24 b of the second inductioncoil 172.

In another embodiment, the second coil may include a first inductioncoil and a second induction coil, which are connected to each other inseries.

The circuit board 250 may include two terminals for electric connectionwith one end of the first induction coil and one end of the secondinduction coil 172.

FIG. 10a illustrates first voltage V1 between the one end 22 a of thefirst induction coil 171 and the intermediate tap 22 c and secondvoltage V2 between the one end 22 b of the second induction coil 172 andthe intermediate tap 22 c, which are shown in FIG. 9 a.

Referring to FIG. 10a , the first voltage V1 of the first induction coil171 is output voltage between the one end 22 a of the first inductioncoil 171 and the intermediate tap 22 c.

The first voltage V1 may be first induced voltage Va1, which isgenerated by mutual induction between the first coil 120 and the firstinduction coil 171.

The second voltage V2 of the second induction coil 172 is output voltagebetween the one end 22 b of the second induction coil 172 and theintermediate tap 22 c (V1=Va1).

The second voltage V2 may be generated based on mutual induction betweenthe first coil 120 and the second induction coil 172 and a voltage dropcaused by the second drive signal Id2.

For example, the second voltage V2 may be the sum of the second inducedvoltage Va2, generated by mutual induction between the first coil 120and the second induction coil 172, and a voltage Vb, generated by thevoltage drop caused by the second drive signal Id2 (V2=Va2+Vb).

For example, ground power may be applied to the intermediate tap 22 c.

The first coil 120 may be moved together with the bobbin 110 in thefirst direction by the electromagnetic force generated by theinteraction between current flowing through the first coil 120 inresponse to the first drive signal Id1 and a magnet 1130.

The first drive signal Id1, which is applied to the first coil 120, maybe an alternating-current signal, e.g. alternating current. For example,the first drive signal Id1 may be a sine wave signal or a pulse signal(e.g. a Pulse Width Modulation (PWM) signal).

Alternatively, in another embodiment, the first drive signal Id1, whichis applied to the first coil 120, may include an alternating-currentsignal and a direct-current signal. The reason for applying analternating-current signal, e.g. an alternating current, to the firstcoil 120 is to induce electromotive force or voltage to the second coil170 through a mutual induction action. The frequency of the PWM signalmay be 20 kHz or more, or may be 500 kHz or more for reduction ofcurrent consumption.

As the first coil 120 moves in the first direction, a first distance D1between the first coil 120 and the first induction coil 171 and a seconddistance D2 between the first coil 120 and the second induction coil 172may be changed. As the first and second distances D1 and D2 are changed,the first induced voltage Va1 is induced to the first induction coil171, and the second induced voltage Va2 may be induced to the secondinduction coil 172.

For example, as the first and second distances D1 and D2 are decreased,the first and second induced voltages Va1 and Va2, which are induced tothe first and second induction coils 171 and 172, may be increased.Conversely, as the first and second distances D1 and D2 are increased,the first and second induced voltages Va1 and Va2, which are induced tothe first and second induction coils 171 and 172, may be decreased.

For example, in the case in which the number of windings of the firstinduction coil 171 and the number of windings of the second inductioncoil 172 are the same as each other, when the first distance D1 and thesecond distance D2 become equal to each other due to movement of themovable unit, the first induced voltage Va1 and the second inducedvoltage Va2 may be equal to each other. However, the disclosure is notlimited thereto. In another embodiment, the number of windings of thefirst induction coil 171 and the number of windings of the secondinduction coil may be different from each other, the first distance D1and the second distance D2 may be different from each other, and thefirst induced voltage Va1 and the second induced voltage Va2 may bedifferent from each other.

The second drive signal Id2, e.g. second drive current, is applied tothe second induction coil 172. The second drive signal Id2 may be analternating-current signal, e.g. alternating current. For example, thesecond drive signal Id2 may be a sine wave signal or a pulse signal(e.g. a Pulse Width Modulation (PWM) signal). Alternatively, in anotherembodiment, the second drive signal Id2, which is applied to the secondinduction coil 172, may include an alternating-current signal and adirect-current signal.

The second drive signal Id2 may be applied to the one end 22 b of thesecond induction coil 172, and may flow between the one end 22 b of thesecond induction coil 172 and the intermediate tap 22 c.

Between the one end 22 b of the second induction coil 172 and theintermediate tap 22 c, voltage Vb may be generated by the voltage dropcaused by the second drive signal Id2 and the resistance of the secondinduction coil 172.

FIG. 10b illustrates first voltage V1″ between the one end 23 a and theopposite end 23 b of the first induction coil 171 and second voltage V2″between the one end 24 a and the opposite end 24 b of the secondinduction coil 172, which are shown in FIG. 9 b.

Referring to FIG. 10b , the first voltage V1″ of the first inductioncoil 171 may be output voltage between the one end 23 a and the oppositeend 23 b of the first induction coil 171, and the second voltage V2″ ofthe second induction coil 172 may be output voltage between the one end24 a and the opposite end 24 b of the second induction coil 172.

Compared to FIG. 10a , in FIG. 10b , no intermediate tap, which isconnected to a ground power source GND, may be used, and the firstinduction coil 171 and the second induction coil 172 may be electricallyseparated from each other. For example, a first ground power source GND1may be connected to the opposite end 23 b of the first induction coil171, and a second ground power source GND2 may be connected to theopposite end 24 b of the second induction coil 172.

The first voltage V1″ may be first induced voltage Va1″ generated bymutual induction between the first coil 120 and the first induction coil171, and the second voltage V2″ may be the sum of second induced voltageVa2″ generated by mutual induction between the first coil 120 and thesecond induction coil 172 and voltage Vb″ generated by the voltage dropcaused by the second drive signal Id2 (V2″=Va2″+Vb″).

The description of the first induced voltage Va1, the second inducedvoltage Va2, and the voltage Vb generated by the voltage drop, made withreference to FIG. 10a , may be identically applied to Va1″, Va2″, andVb″ shown in FIG. 10 b.

The first induced voltage V1 generated at the first induction coil 171is influenced by the distance D1 between the first coil 120 and thefirst induction coil 170-1. Therefore, it is possible to sense thedisplacement of the bobbin 110, at which the first coil 120 is located,based on the magnitude of the first induced voltage V1 and to performfeedback control of auto focusing of the bobbin 110 in the firstdirection using the displacement of the bobbin 110 that is sensed.

In general, in order to perform auto focus (AF) feedback control, aposition sensor for sensing the displacement of the AF movable unit,e.g. the bobbin, and an additional power connection structure fordriving the position sensor are required, which may lead to an increasein the price of the lens driving apparatus and difficulty inmanufacturing.

In addition, a linear section (hereinafter, referred to as a “firstlinear section) in a graph, which indicates the relationship between amoving distance of the bobbin and a magnetic flux of the magnet sensedby the position sensor, may be limited by the positional relationshipbetween the magnet and the position sensor.

Since the embodiment does not need a separate position sensor forsensing the displacement of the bobbin 110, it is possible to reduce themanufacturing costs of the lens driving apparatus and to improveconvenience in manufacturing.

In addition, since the embodiment uses mutual induction between thefirst coil 120 and the first induction coil 171, the linear section inthe graph, which indicates the relationship between the moving distanceof the bobbin 110 and the first induced voltage V1, may be expandedcompared to the first linear section. As a result, the embodiment iscapable of assuring linearity within a wider section, lowering a defectrate, and performing AF feedback control more accurately.

FIG. 11 illustrates variation in the voltage Va1 or Va2, which isinduced to the first induction coil 171 or the second induction coil172, according to the ambient temperature.

In FIG. 11, the horizontal axis represents the displacement of themovable unit, and the vertical axis represents the voltage Va1 or Va2,which is induced to the first induction coil 171 or the second inductioncoil 172. f1 represents the voltage induced to the first or secondinduction coil when the ambient temperature is 25° C., and f2 representsthe voltage induced to the first or second induction coil when theambient temperature is 65° C.

Referring to FIG. 11, the voltage Va1 or Va2, which is induced to thefirst or second induction coil 171 or 172, increases as the ambienttemperature rises. As such, the voltage Va1 or Va2, which is induced tothe first or second induction coil 171 or 172, varies according tovariation in ambient temperature. Therefore, when an AF feedbackoperation is performed, the lens mounted to the lens driving apparatusmay be defocused.

For example, when the temperature is 25° C., the lens mounted to thelens driving apparatus has a first focal point due to the AF feedbackoperation. However, when the temperature is 65° C., the lens may have asecond focal point, which is different from the first focal point. Thisis because the first induced voltage induced to the first induction coil171 at 65° C. is increased so as to be higher than the first inducedvoltage induced to the first induction coil 171 at 25° C. and becausethe lens of the lens driving apparatus is moved by the AF feedbackoperation based on the increased first induced voltage.

The variation in the ambient temperature also has an influence on thefocal length of the lens mounted to the lens driving apparatus as wellas the first induced voltage Va1 of the first induction coil 171. Forexample, when the ambient temperature rises, the lens mounted to thelens driving apparatus may be expanded or contracted, and accordinglythe focal length of the lens may be increased or decreased. Theexpansion or contraction of the lens may be determined according to thekind of lens.

The AF feedback operation is compensated for in consideration ofvariation in the first and second induced voltages and/or variation inthe focal length of the lens, which is caused by variation in ambienttemperature. Therefore, the embodiment is capable of inhibiting the lensfrom being defocused due to variation in ambient temperature.

In order to compensate for an error attributable to variation in ambienttemperature, it is required to detect variation in ambient temperature.It may be possible to detect variation in ambient temperature based onthe first voltage V1 of the first induction coil 171 and the secondvoltage of the second induction coil 172.

The second drive current Id2 may be applied to the second induction coil172, and a voltage may be generated at the second induction coil 172 dueto a voltage drop. The voltage Vb generated by the voltage drop causedby the second drive current Id2 is influenced by variation in ambienttemperature.

The material of the first and second induction coils 171 and 172 may bea metal the resistance value of which varies according to variation intemperature, e.g. copper (Cu). For example, the temperature coefficientof resistance of copper (Cu) may be 0.00394Ω/° C. Therefore, as theambient temperature rises, the resistance value of the second inductioncoil 172 may increase, and the voltage Vb generated by the voltage dropcaused by the second drive current Id2 may increase. Conversely, as theambient temperature drops, the voltage Vb generated by the voltage dropcaused by the second drive current Id2 may decrease.

Because the induced voltages generated by mutual induction of the firstinduction coil 171 and the second induction coil 172 are identicallyinfluenced by variation in ambient temperature, the difference betweenthe first induced voltage Va1 and the second induced voltage Va2 may beconstant in spite of variation in ambient temperature. For example, inthe case in which the number of windings of the first coil and thenumber of windings of the second coil are the same as each other,variation in the first induced voltage Va1 and variation in the secondinduced voltage Va2, which are caused by variation in ambienttemperature, may be the same as each other.

The voltage Vb generated by the voltage drop of the second inductioncoil 172 is also changed by being influenced by variation in ambienttemperature.

In conclusion, variation in the difference between the first voltage V1and the second voltage V2 may be variation in Vb attributable tovariation in ambient temperature, and the AF feedback operation may becompensated for based on the variation in the difference between thefirst voltage V1 and the second voltage V2 (e.g. the variation in Vb).

The lens driving apparatus 100 shown in FIG. 1 may further include acapacitor, which is connected in parallel to the second coil 170 inorder to remove PWM noise.

FIG. 12 illustrates a capacitor 175 for removing PWM noise.

Referring to FIG. 12, the second coil 170 may be connected to theterminals (e.g. 251-3 to 251-6) of the circuit board 250. For example,one end 22 a of the first induction coil 171 may be connected to thethird terminal 251-3 of the circuit board 250, one end 22 b of thesecond induction coil 172 may be connected to the sixth terminal 251-6of the circuit board 250, and the intermediate tap 22 c may be connectedto the fifth terminal 251-5 of the circuit board 250.

One end of the capacitor 175 may be connected to the third terminal251-3 of the circuit board 250, and the opposite end of the capacitor175 may be connected to the sixth terminal 251-6 of the circuit board250. The capacitor 175 may be connected in parallel to the firstinduction coil 171 and the second induction coil 172, which areconnected in series to each other.

In another embodiment, instead of the capacitor 175, there may beprovided a first capacitor connected to a point between the fifthterminal 251-5 and the third terminal 251-3 and a second capacitorconnected to a point between the fifth terminal 251-5 and the sixthterminal 261-6.

FIG. 12 illustrates the embodiment shown in FIG. 10a . The configurationshown in FIG. 12 may be identically applied to the embodiments shown inFIGS. 10a and 10 b.

FIG. 13a illustrates the frequency response characteristics with respectto the gain of output of the second coil 170 according to the presenceof the capacitor 175, and FIG. 13b illustrates the frequency responsecharacteristics with respect to the phase of the output of the secondcoil 170 according to the presence of the capacitor 175.

Referring to FIGS. 13a and 13b , through the addition of the capacitor175, PWM noise may be removed, and the gain in the frequency range of 1kHz or higher within an audible frequency may be reduced.

FIG. 14 is an exploded perspective view of a lens driving apparatus 200according to another embodiment, FIG. 15 is an exploded perspective viewof a base 1210, a circuit board 1250 and a third coil 1130 shown in FIG.14, FIG. 16 is an assembled perspective view of the lens drivingapparatus 200 shown in FIG. 14, from which a cover member 1300 isremoved, FIG. 17 is a plan view of FIG. 16, FIG. 18 is a sectional viewof FIG. 17 when viewed in the AB direction, and FIG. 19 is a perspectiveview of the lens driving apparatus shown in FIG. 16, from which a bobbin1110 and a second coil 1170 are removed.

Referring to FIGS. 14 to 19, the lens driving apparatus 200 includes abobbin 1110, a first coil 1120, a magnet 1130, a housing 1140, an upperelastic member 1150, a lower elastic member 1160, a second coil 1170, asupport member 220, a third coil 1230, a circuit board 1250, and firstand second position sensors 240 a and 240 b. The lens driving apparatus200 may further include a cover member 1300 and a base 1210.

The description of the cover member 300 shown in FIG. 1 may beidentically applied to the cover member 1300.

The bobbin 1110 is disposed inside the housing 1140. The description ofthe shape of the bobbin 110, the upper support protrusions 144, thelower support protrusions and the coil-receiving recess, which are shownin FIG. 1, may be identically applied to the configuration of the bobbin1110.

The first coil 1120 is disposed around the outer circumferential surfaceof the bobbin 1110. The description of the first coil 120 shown in FIG.1 may be identically applied to the configuration, arrangement andfunction of the first coil 1120.

The housing 1140 may be formed in the shape of a hollow column thatincludes an upper end portion 1141 and a side portion 1142 connected tothe lower surface of the upper end portion 1141 to support the upper endportion 1141.

The magnet 1130 may be disposed around the outer circumferentialsurface, e.g. the side portion, of the housing 1140. The description ofthe stopper, the upper frame support protrusions and the lower framesupport protrusions of the housing 140 shown in FIG. 1 may beidentically applied to the housing 1140.

The housing 1140 may have through-holes formed in the corners of anupper end portion 1141 thereof, through which the elastic supportmembers 220 are inserted.

The housing 1140 may be provided in the upper end portion 1141 thereofwith a seat portion 1149, in which the second coil 1170 is disposed. Forexample, the seat portion 1149 may be formed such that the outercircumferential surface of the upper end portion 1141 of the housing1140 is depressed.

The second coil 1170 seated on the seat portion 1149 may be spaced apartfrom the upper elastic member 1150 disposed on the upper surface of theupper end portion 1141. The reason for this is to inhibit the remainingparts of the upper elastic member, except for the divided parts of theupper elastic member that are connected to the second coil 1170, frombeing electrically connected to the second coil 1170.

For example, the second coil 1170 may be generally formed in the shapeof a closed loop when viewed in the first direction so as to surroundthe outer circumferential surface of the upper end portion of thehousing 1140. Therefore, the seat portion 1149 may be formed in a shapecorresponding to or coinciding with the shape of the second coil 1170 soas to surround the upper portion of the housing 1140.

The second coil 1170 may be fixed or coupled to the seat portion 1149 ofthe housing 1140 using epoxy, a thermosetting adhesive, or aphoto-curable adhesive.

In order to increase electromotive force generated by mutual inductionbetween the first coil 1120 and the second coil 1170, the first coil1120 and the second coil 1170 may be arranged such that the windingdirection of the first coil 1120 and the winding direction of the secondcoil 1170 are parallel to each other.

That is, both the first coil 1120 and the second coil 1170 may be woundabout the optical axis, for example, in the clockwise direction or inthe counterclockwise direction.

The description of the seat portion 149 of the housing 140 shown in FIG.3 may be identically applied to the seat portion 1149 of the housing1140.

The magnet 1130 may be disposed in the housing 1140. The description ofthe magnet 130 shown in FIG. 1 may be identically applied to theconfiguration, arrangement and function of the magnet 1130.

The upper elastic member 1150 and the lower elastic member 1160 may becoupled to the bobbin 1110 and the housing 1140, and may flexiblysupport the bobbin 1110.

The upper elastic member 1150 may be divided into a plurality of parts.For example, the upper elastic member 1150 may include first to fourthelastic members 1150-1 to 1150-4, which are separated from each other.

Each of the first to fourth upper elastic members 1150-1 to 1150-4 mayinclude an inner frame 1151 coupled to the bobbin 1110, an outer frame1152 coupled to the housing 1140, and a connection portion 1153 forconnecting the inner frame 1151 and the outer frame 1152 to each other.

Alternatively, in another embodiment, the outer frame 1152 of at leastone of the first to fourth upper elastic members 1150-1 to 1150-4 may bedivided into two or more parts, and the second coil 1170 may beelectrically connected to at least one of the divided outer frames. Atleast one of the divided outer frames may be provided with a separatesoldering portion, to which the second coil 1170 is bonded.

The lower elastic member 1160 may be divided into a plurality of parts.For example, the lower elastic member 1160 may include a first lowerelastic member 1160-1 and a second lower elastic member 1160-2, whichare separated from each other.

Like the upper elastic member 150 shown in FIG. 1, each of the upperelastic member 1150 and the lower elastic member 1160 may include aplurality of inner connection portions and a plurality of outerconnection portions.

The first coil 1120 may be electrically connected to two of the innerconnection portions of the upper and lower elastic members 1150 and1160, and the second coil 1170 may be electrically connected to at leastthree other inner connection portions.

The outer connection portions of the upper and lower elastic members1150 and 1160 may be electrically connected to the circuit board 1250through the support member 220.

Through the support member 220 and the upper and lower elastic members1150 and 1160, a first drive signal may be supplied from the circuitboard 1250 to the first coil 1120, a second drive signal may be suppliedfrom the circuit board 1250 to the second coil 1170, and the output ofthe second coil 1170 may be transmitted to the circuit board 1250. Here,the first drive signal may be the same as the first drive signal that isapplied to the first coil 120, which was described with reference toFIG. 1, and the second drive signal may be the same as the second drivesignal that is applied to the second induction coil 172. The output ofthe second coil 1170 may be the output V1 of the first induction coil171 and the output V2 of the second induction coil, which are shown inFIG. 1.

The description of the upper and lower elastic members 150 and 160 shownin FIG. 1 may be identically applied to the upper elastic member 1150and the lower elastic member 1160, which are shown in FIG. 14. However,as described above, the upper elastic member 1150 shown in FIG. 14 maybe electrically connected to the support member 220.

The base 1210 may be located under the bobbin 1110, and may have asupport recess, which is formed in the surface thereof that faces theportion of the circuit board 1250 at which a terminal surface 1253 isformed.

In addition, the base 1210 may have a first position sensor seat recess215 a, which is depressed from the upper surface thereof and in which afirst position sensor 240 a is disposed, and a second position sensorseat recess 215 b, which is depressed from the upper surface thereof andin which a second position sensor 240 b is disposed. For example, animaginary line connecting the first position sensor seat recess 215 aand the center of the base 1210 and an imaginary line connecting thesecond position sensor seat recess 215 b and the center of the base 1210may make an angle of 90° therebetween.

The first and second position sensors 240 a and 240 b may be disposed inthe position sensor seat recesses 215 a and 215 b in the base 1210,which is located under the circuit board 1250, and may be electricallyconnected to the circuit board 1250.

When the housing 1140 moves in the second direction and/or in the thirddirection, the first and second position sensors 240 a and 240 b maysense variation in the magnetic force generated from the magnet 1130.

For example, each of the first and second position sensors 240 a and 240b may be constituted by a Hall sensor alone or by a driver including aHall sensor, which, however, is illustrative. Any sensor capable ofsensing a position, in addition to the magnetic force, may be used. Thefirst and second position sensors 240 a and 240 b may be sensors foroptical image stabilizer (OIS).

The third coil 1230 may be disposed on the circuit board 1250, and thefirst and second position sensors 240 a and 240 b may be disposed underthe circuit board 1250.

The circuit board 1250 may be disposed on the upper surface of the base1210 and may have therein a hollow, which corresponds to the hollow inthe bobbin 1110, the hollow in the housing 1140, and/or the hollow inthe base 1210.

The circuit board 1250 may have at least one terminal surface 1250 a,which is bent and extends from the upper surface thereof, and which iselectrically connected to the support member 220, and at which aplurality of terminals or pins for receiving electrical signals from theoutside or supplying electrical signals to the outside is formed.

The circuit board 1250 may be a flexible printed circuit board (FPCB).However, the disclosure is not limited thereto. The circuit board 1250may be a PCB, or the terminals of the circuit board 1250 may be directlyformed on the surface of the base 1210 through a process of forming asurface electrode.

As described above with reference to FIG. 12, the lens driving apparatus200 may further include a capacitor, which is connected in parallel totwo terminals of the circuit board 1250, which is electrically connectedto the second coil 1170. Alternatively, the lens driving apparatus 200may further include a first capacitor connected to a point between oneend of the second coil 1170 and an intermediate tap and a secondcapacitor connected to a point between the opposite end of the secondcoil and the intermediate tap.

The third coil 1230 is disposed on the upper surface of the circuitboard 1250 so as to correspond to or be aligned with the magnet 130. Thenumber of third coils 1230 may be one or more, or may be the same as thenumber of magnets 1130. However, the disclosure is not limited thereto.

The third coil 1230 may be embodied by forming a coil on an additionalboard 231, which is provided separately from the circuit board 1250.However, the disclosure is not limited thereto. The third coil 1230 maybe disposed on the circuit board 1250 while being spaced aparttherefrom, without an additional board.

Although it is illustrated in FIG. 15 that four third coils 1230 a to1230 d are disposed on the circuit board 1250, the number of third coilsis not limited thereto.

As described above, the third coil 1230 may be electrically connected tothe circuit board 1250. A drive signal, e.g. drive current, may besupplied to the third coil 1230. The housing 1140 may be moved in thesecond direction and/or in the third direction, e.g. in the x-axisdirection and/or in the y-axis direction, by the electromagnetic forcegenerated by the interaction between the magnet 1130 and the third coil1230, which are arranged so as to face each other or to be aligned witheach other. Hand tremor compensation may be performed by controlling themovement of the housing 1140.

The support member 220 may be coupled at the upper end thereof to theupper elastic member 1150, may be coupled at the lower end thereof tothe base 1210, the board 231 or the circuit board 1250, and may supportthe bobbin 1110 and the housing 1140 so that the bobbin 1110 and thehousing 1140 are movable in a direction perpendicular to the firstdirection.

The support member 220 may be provided in a plural number, and each ofthe support members may be disposed on the outer surfaces of the cornersof the housing.

Each of the support members 220 may be formed separately from the upperelastic member 1150, and may be embodied by an elastic support membersuch as, for example, a leaf spring, a coil spring, or a suspensionwire. Alternatively, in another embodiment, the support members 220 maybe integrally formed with the upper elastic member 1150.

Referring to FIG. 14, like the second coil 170 shown in FIG. 1, when thebobbin 1110 moves in the first direction, the second coil 1170 serves tosense the displacement of the movable unit, e.g. the bobbin 1110.

As shown in FIGS. 16 to 18, the housing 1140 may have a polygonal shapewhen viewed in the first direction, and the second coil 1170 may bedisposed so as to surround the outer surface of the upper end portion1141 of the housing 140.

In the embodiment, the side portion of the housing 1140 may include fourside surfaces, which are arranged in a quadrangular shape when viewedfrom above. However, the disclosure is not limited thereto. The sidesurfaces of the housing may be arranged in a polygonal shape.

Alternatively, in another embodiment, the second coil 1170 may bedisposed on the inner surface of the cover member 300.

The reason for disposing the second coil 1170 on the outer surface ofthe upper end portion of the housing 1140 is to increase the distancefrom the third coil 1230 to the second coil 1170 in the first directionand consequently to minimize the influence of the third coil 1230 on theoutput of the second coil 1170.

The drive signal that is applied to the second coil 1230 may be analternating-current signal. When the drive signal is applied to thethird coil 1230, an electromagnetic wave or electromagnetic field may begenerated from the third coil 1230. This electromagnetic wave orelectromagnetic field may make the second coil 1170 generateelectromotive force, current and voltage due to mutual induction action.

Because the electromotive force induced to the second coil 1170 by thethird coil 1230 has an influence on the output of the second coil 1170,it may be difficult for the second coil 1170 to sense the position ofthe bobbin 1110 accurately.

The second coil 1170 may include a first induction coil 1171 and asecond induction coil 1172. The description of the arrangement, functionand operation of the first and second induction coils 171 and 172, thesensing of displacement of the movable unit, and the temperaturecompensation, which was made with reference to FIGS. 7 to 12, may beidentically applied to the first and second induction coils 1171 and1172 of the second coil 1170.

Therefore, since it is possible to sense the displacement of the bobbin1110 using the second coil 1170, at which electromotive force isgenerated by mutual induction, without using a separate AF positionsensor, the embodiment is capable of simplifying the configuration ofthe lens driving apparatus and of reducing manufacturing costs.

FIG. 20 illustrates an upper elastic member, a lower elastic member, anda support member according to another embodiment.

Referring to FIG. 20, the upper elastic member may include a pluralityof divided upper elastic members 1150-1 to 1150-6. For example, theupper elastic member may include first to sixth upper elastic members1150-1 to 1150-6, which are spaced apart from each other.

Each of the first to fourth upper elastic members 1150-1 to 1150-4 mayinclude a first inner frame 1151 coupled to the bobbin 1110, a firstouter frame 1152 coupled to the housing 1140, and a first connectionportion 1153 for connecting the first inner frame 1151 and the firstouter frame 1152 to each other.

For example, a through-hole 1151 a in the first inner frame 1151 and acoupling protrusion of the bobbin 1110 may be coupled to each other anda through-hole 1152 a in the first outer frame 1152 and an upper supportprotrusion of the housing 1140 may be coupled to each other by thermalfusion or using an adhesive member such as epoxy.

Each of the fifth and sixth upper elastic members 1150-5 and 1150-6 maynot be coupled to the bobbin 1110 but may be coupled only to the housing1140. However, the disclosure is not limited thereto. In anotherembodiment, the fifth and sixth upper elastic members may be coupled toboth the bobbin and the housing.

The lower elastic member shown in FIG. 20 may include a plurality ofdivided lower elastic members.

For example, the lower elastic member may include a first lower elasticmember 1160-1 and a second lower elastic member 1160-2, which are spacedapart from each other.

Each of the first and second lower elastic members 1160-1 and 1160-2 mayinclude a second inner frame 1161 coupled to the bobbin 1110, a secondouter frame 1162 coupled to the housing 1140, and a second connectionportion 1163 for connecting the second inner frame 1161 and the secondouter frame 1162 to each other.

The first coil 1120 may be connected to two of the first and secondinner frames of the upper and lower elastic members.

For example, the two opposite ends of the first coil 120 may beconnected or bonded to the second inner frames of the first and secondlower elastic members 1160-1 and 1160-2 by soldering or using aconductive adhesive member.

The first induction coil 1171 may be connected to two other first andsecond inner frames of the upper and lower elastic members, and thesecond induction coil 1172 may be connected to two other first andsecond inner frames of the upper and lower elastic members.

For example, the first induction coil 1171 may be connected to two ofthe first inner frames of the first to fourth upper elastic members1150-1 to 1150-4 by soldering or using a conductive adhesive member.

In addition, the second induction coil 1172 may be connected to twoother first inner frames of the first to fourth upper elastic members1150-1 to 1150-4 by soldering or using a conductive adhesive member.

For example, the first induction coil 1171 may be connected or bonded tothe first and second upper elastic members 1150-1 and 1150-2, and thesecond induction coil 1172 may be connected or bonded to the third andfourth upper elastic members 1150-3 and 1150-4.

The support member shown in FIG. 20 may be provided in a plural number,and each of the support members 1220-1 to 1220-8 may be disposed atsecond side portions 1141 of the housing 1140.

Referring to FIG. 20, in order to arrange the support memberssymmetrically, the first support member 1220-1 includes two wires 1220 a1 and 1220 b 1, and the third support member 1220-3 includes two wires1220 a 2 and 1220 b 2. However, the disclosure is not limited thereto.The support members may be arranged symmetrically in various othershapes. This is for enabling the support members to support the housingin a balanced manner. At least one of the two wires 1220 a 1 and 1220 b1 and at least one of the two wires 1220 a 2 and 1220 b 2 may beelectrically connected to the circuit board.

Each of the support members 1220-1 to 1220-8 may be formed separatelyfrom the upper elastic member 1150, and may be embodied by an elasticsupport member such as, for example, a leaf spring, a coil spring, or asuspension wire. Alternatively, in another embodiment, the supportmembers 1220 may be integrally formed with the upper elastic member1150.

For example, each of the first to sixth support members 1220-1 to 1220-6may electrically connect a corresponding one of the first to sixthelastic members 1150-1 to 1150-6 to the circuit board 1250.

The seventh support member 1220-7 may connect the fifth upper elasticmember 1150-5 and the first lower elastic member 1160-1 to each other,and the eighth support member 1220-8 may connect the sixth upper elasticmember 1150-6 and the second lower elastic member 1160-2 to each other.

For example, the first coil 1120, which is connected to the first andsecond lower elastic members 1160-1 and 1160-2, may be electricallyconnected to the circuit board 1250 by the seventh and eighth supportmembers 1220-7 and 1220-8 and the fifth and sixth upper elastic members1150-5 and 1150-6.

The first induction coil 1171, which is connected to the first andsecond upper elastic members 1150-1 and 1150-2, may be electricallyconnected to the circuit board 1250 by the first and second supportmembers 1220-1 and 1220-2.

The second induction coil 1172, which is connected to the third andfourth upper elastic members 1150-3 and 1150-4, may be electricallyconnected to the circuit board 1250 by the third and fourth supportmembers 1220-3 and 1220-4.

In order to absorb and alleviate the vibration of the bobbin 1110, thelens driving apparatus 200 may further include a first damping member(not shown), which is disposed between each of the upper elastic members1150-1 to 1150-6 and the housing 1140.

For example, the lens driving apparatus 200 may further include a firstdamping member (not shown), which is disposed in the space between thefirst connection portion 1153 of each of the upper elastic members1150-1 to 1150-4 and the housing 1140.

In addition, for example, the lens driving apparatus 200 may furtherinclude a second damping member (not shown), which is disposed betweeneach of the second connection portions 1163 of the lower elastic members1160-1 and 1160-2 and the housing 1140.

In addition, for example, the lens driving apparatus 200 may furtherinclude a damping member (not shown), which is disposed between theinner surface of the housing 1140 and the outer circumferential surfaceof the bobbin 1110.

In addition, the lens driving apparatus 200 may further include adamping member (not shown), which is disposed at a portion at which thesupport member 1220 and the upper elastic member 1150 are coupled orbonded to each other.

In addition, the lens driving apparatus 200 may further include adamping member (not shown), which is disposed at a portion at which thecircuit board 1259 and/or the base 1210 and the support member 1220 arecoupled or bonded to each other.

FIG. 21a illustrates the arrangement of the second coil 1170 accordingto another embodiment, and FIG. 21b is a perspective view of the secondcoil shown in FIG. 21a , from which the bobbin 1110 and the firstinduction coil 1171 are removed.

Referring to FIGS. 21a and 21b , the first induction coil 1171 of thesecond coil 1170 may be disposed so as to surround the outercircumferential surface of the upper end portion of the housing 1140 soas to rotate about the optical axis in the clockwise direction or in thecounterclockwise direction.

The second induction coil 1172 of the second coil 1170 may be disposedin the shape of a coil ring that is wound around one of the sideportions of the housing 1140 about an axis perpendicular to the opticalaxis in the clockwise direction or in the counterclockwise direction.

The housing 1140 may be provided on one side portion thereof with a seatportion 1142, which includes at least one winding protrusion 1142 baround which the second induction coil 1172 is wound.

For example, the seat portion 1142 of the housing 1140 may include arecess portion 1142 a, which is depressed from one side portion of thehousing 1140, and at least one winding protrusion 1142 b, whichprotrudes from the recess portion 1142 a.

For example, the second induction coil 1172 may be formed in the shapeof a closed loop, which is disposed in the recess portion 1142 a andwhich includes a straight portion 1172 a and a curved portion 1172 b,and may be wound around the winding protrusion 1147.

In another embodiment, the first induction coil 1171 may be disposed onthe seat portion 1142 of the housing 1140, and the second induction coil1172 may be disposed on the seat portion 1149 of the housing 1140.

In general, the equivalent circuit of the coil may include a resistanceelement, an inductance element, and a capacitance element. The coilgenerates resonance at a self-resonance frequency. In this state,current and voltage, which flow through the coil, are maximized.

In order to inhibit deterioration in the auto focusing function and thehand tremor compensation function of the lens driving apparatus, it isdesirable for the first coil 1120 and the second coil 1170 to bedesigned to have different self-resonance frequencies from each otherand for the second coil 1170 and the third coil 1230 to be designed tohave different self-resonance frequencies from each other.

For example, in order to suppress the incidence of audio noise, it isdesirable that the difference between the self-resonance frequency ofthe first coil 1120 and the self-resonance frequency of the second coil1170 be set to 20 kHz or higher. For example, the difference between theself-resonance frequency of the first coil 1120 and the self-resonancefrequency of the second coil 1170 may range from 20 kHz to 3 MHz, andthe difference between the self-resonance frequency of the second coil1170 and the self-resonance frequency of the third coil 1230 may rangefrom 20 kHz to 3 MHz.

The self-resonance frequency of the third coil 1230 may be set to behigher than the self-resonance frequency of the first coil 1120.Further, the self-resonance frequency of the third coil 1230 may be setto be higher than the self-resonance frequency of the second coil 1170.

For example, the difference between the self-resonance frequency of thethird coil 1230 and the self-resonance frequency of the first coil 1120may be set to 50 kHz or higher.

In order to suppress the incidence of high-frequency noise attributableto the PWM operation, the first and second coils 1120 and 1170 may bedriven such that the self-resonance frequency of each of the first andsecond coils 1120 and 1170 is 20 kHz or higher. Further, in order toreduce current consumption, the first and second coils 1120 and 1170 maybe driven such that the self-resonance frequency of each of the firstand second coils 1120 and 1170 is 500 kHz or higher.

FIG. 22 shows the first induced voltage Va1 of the first induction coil171 according to the displacement of the movable unit when the ambienttemperature is room temperature, and a code value corresponding to thedisplacement of the AF movable unit.

Referring to FIG. 22, when the ambient temperature is room temperature,the displacement (or position) of the movable unit may range from d0 todn (n is a natural number; n>1). The code value for AF feedback control,which corresponds to the displacement (or position) of the movable unit,may be set to a value ranging from code_0 to code_n.

In addition, when the ambient temperature is room temperature, the firstinduced voltage V1, which is induced to the first induction coil 171corresponding to the displacement of the movable unit, may range from P0to Pn.

When the ambient temperature is room temperature and when thedisplacement is a first displacement dl, the first induced voltage(V1=Va1) of the first induction coil 171 may be P1, and the code valuemay be code_1.

However, if the ambient temperature rises above room temperature, thefirst induced voltage (V1=Va1) of the first induction coil 171 at thefirst displacement dl may have a value (e.g. a value greater than P1)different from P1.

The controller 830 compensates for error in the displacement of themovable unit according to variation in ambient temperature.

FIG. 23 is a flowchart showing a temperature compensation method withrespect to the AF feedback according to the embodiment.

Referring to FIG. 23, the controller 830 receives the first voltage V1of the first induction coil 171 and the second voltage of the secondinduction coil 172 (S110).

The controller 830 detects the difference between the first voltage V1and the second voltage V2 (S120).

The controller 830 detects the ambient temperature or variation inambient temperature based on the difference between the first voltage V1and the second voltage V2 (S130).

The controller 830 compensates for the displacement of the movable unitof FIG. 9 or the code value based on the detected temperature or thedetected variation in the temperature. For example, the controller 830may compensate for the displacement of the movable unit or the codevalue based on the variation in the temperature.

The variation in the temperature may be a difference between thedetected temperature and the room temperature. For example, in order tocompensate for the displacement of the movable unit based on thevariation in the temperature, two or more reference temperature valuesare required, and the displacement of the movable unit may becompensated for using a regression equation based on the two or morereference temperature values.

For example, the controller 830 may control the displacement of themovable unit or the code value using the detected temperature and atemperature compensation algorithm. The temperature compensationalgorithm may be designed based on the temperature coefficient ofresistance of the second induction coil 172, the coefficient of thermalexpansion of the lens, or a temperature function related to thermalexpansion.

For example, some lenses are expanded in proportion to an increase intemperature, whereby the focal length thereof is increased, whereas somelenses are contracted in proportion to an increase in temperature,whereby the focal length thereof is deceased.

The controller 830 may compensate for the displacement of the movableunit or the code value based on variation in the focal length of thelens according to variation in ambient temperature as well as variationin the mutually-induced voltage generated by mutual induction accordingto variation in ambient temperature.

The output of the first induction coil 171 for sensing the displacementof the movable unit may vary according to variation in ambienttemperature. The embodiment is capable of inhibiting defocusing bycompensating for variation in the output of the first induction coil 171according to variation in ambient temperature, thereby achievingaccurate auto focusing.

FIG. 24 is a schematic perspective view of a lens driving apparatus 300according to another embodiment, FIG. 25 is an exploded perspective viewof FIG. 24, FIG. 26 is a view of the lens driving apparatus of FIG. 24,from which a cover member 2310 is removed, FIG. 27 is a perspective viewof a bobbin 2110 shown in FIG. 25, FIG. 28 is a first perspective viewof a housing 2140 shown in FIG. 25, FIG. 29 is a second perspective viewof the housing 2140 shown in FIG. 25, FIG. 30 is a rear perspective viewof the housing 2140 to which the bobbin 2110 and a lower elastic member2150 of FIG. 25 are coupled, FIG. 31 is a plan view illustrating theinitial state of an upper elastic member 2150 shown in FIG. 25, FIG. 32is a view illustrating the state in which the upper elastic member 2150of FIG. 25 is divided into first and second upper elastic members, FIG.33 is an enlarged view of portion “A” in FIG. 26, FIGS. 34 and 35 areviews illustrating a base 2210, a circuit board 2250 and a second coil2230 of FIG. 25, FIG. 36 is a plan view illustrating the couplingstructure of the second coil 2230 coupled to the circuit board 2250 ofFIG. 25, FIG. 37 is a view illustrating the bottom surface of the base2210 of FIG. 25, FIG. 38 is a sectional view taken along line I-I′ inFIG. 26, FIG. 39 is a sectional view taken along line II-IF in FIG. 26,FIG. 40 is a sectional view taken along line in FIG. 26, and FIG. 41 isa view illustrating the constitution related to a sensing coil 2400 ofFIG. 25.

As shown in FIGS. 24 and 25, the lens driving apparatus 300 according tothe embodiment may include a first lens driving apparatus 2100 and asecond lens driving apparatus 2200. At this time, the first lens drivingapparatus 2100 may be a driving unit for auto focusing, and the secondlens driving apparatus 2200 may be a driving unit for hand tremorcompensation.

The first lens driving apparatus 2100 may include a bobbin 2110, a firstcoil 2120, a magnet 2130, and a housing 2140.

The bobbin 2110 may be mounted inside the housing 2140 so as toreciprocate in a direction parallel to the optical axis. The first coil2120 may be mounted on the outer circumferential surface of the bobbin2110 so as to electromagnetically interact with the magnet 2130. Inaddition, the bobbin 2110 may be elastically supported by upper andlower elastic members 2150 and 2160, and may perform an auto focusingfunction by moving in the first direction.

Although not illustrated, the bobbin 2110 may include a lens barrel (notshown), in which at least one lens is installed. However, the lens maybe directly received in the bobbin 2110, and a separate lens barrel maybe omitted. The lens barrel may be coupled to the inside of the bobbin2110 in any of various manners. For example, female threads may beformed in the inner circumferential surface of the bobbin 2110, and malethreads, capable of engaging with the female threads, may be formed inthe outer circumferential surface of the lens barrel. However, thedisclosure is not limited thereto. Alternatively, one or more lenses maybe integrally formed with the bobbin 2110, without the lens barrel. Asingle lens may be coupled to the lens barrel, or two or more lenses maybe coupled to the lens barrel in order to constitute an optical system.

The bobbin 2110 may include a first stopper 2111 and/or a second stopper2112. The first stopper 2111 may be referred to as an upper stopper andthe second stopper 2112 may be referred to as a lower stopper.

The first stopper 2111 may inhibit the top surface of a body of thebobbin 2110 from directly colliding with the inside of the cover member2300 although the bobbin 2110 deviates from a prescribed range due toexternal impact when the bobbin 2110 moves in the first direction toperform an auto focusing function. In addition, the first stopper 2111may also function to guide a mounting position of the upper elasticmember 1150.

For example, a plurality of first stoppers 2111 may protrude upwards bya first height h1. At least four stoppers may each protrude in the formof a polygonal post. In addition, the first stoppers 2111 may besymmetrically arranged about the center of the bobbin 2110. However, thedisclosure is not limited thereto. The first stoppers may beasymmetrically arranged to avoid interference with other parts.

The second stopper 2112 may inhibit the bottom surface of the body ofthe bobbin 2110 from directly colliding with the base 2210 and the topsurface of the circuit board 2250 shown in the sectional views of FIGS.25 and 39 although the bobbin 2110 deviates from a prescribed range dueto external impact when the bobbin 2110 moves in the first direction toperform an auto focusing function. For example, the second stopper 2112may protrude from the edge of the bobbin 2110 in a circumferentialdirection, and the housing 2140 may be provided with a seat recess 2146formed at a portion corresponding to the second stopper 2112.

In the case in which the second stopper 2112 is initially located on abottom 2146 a (see FIG. 28) of the seat recess 2146 in contacttherewith, the bobbin 2110 may move upwards when current is supplied tothe first coil 1120 and move downwards when no current is supplied tothe first coil 1120, as in unidirectional control in a voice coil motor,to realize the auto focusing function.

On the other hand, in the case in which the second stopper 2112 isinitially spaced apart from the bottom 2146 a of the seat recess 2146 bya predetermined distance, the auto focusing function may be controlledlike bi-directional control in the voice coil motor. That is, the bobbin2110 may move upwards or downwards in a direction parallel to theoptical axis to realize the auto focusing function. For example, thebobbin 2110 may move upwards when forward current is supplied to thefirst coil 2120, and the bobbin 2110 may move downwards when reversecurrent is supplied to the first coil 2120.

Meanwhile, the seat recess 2146 of the housing 2140 may be depressed,and may have a second width w2 that is greater than the first width w1of the second stopper 2112, whereby the rotation of the second stopper2112 in the seat recess 2146 may be restricted. Even when force isapplied to the bobbin 2110 in the direction in which the bobbin 2110 isrotated about the optical axis, rather than in the optical-axisdirection, therefore, the second stopper 2112 may inhibit the rotationof the bobbin 2110.

In addition, a plurality of upper support protrusions 2113 may beprotrudingly formed at the top surface of the bobbin 2110, and aplurality of lower support protrusions 2114 (see FIG. 30) may beprotrudingly formed at the bottom surface of the bobbin 2110.

As shown in FIG. 26, the upper support protrusions 2113 may each have acylindrical or prismatic shape. The upper support protrusions 2113 mayfix an inner frame 2151 of the upper elastic member 2150 and the bobbin2110 by coupling.

For example, the inner frame 2151 of the upper elastic member 2150 maybe provided at portions thereof corresponding to the upper supportprotrusions 2113 with first through-holes 2151 a. The upper supportprotrusions 2113 and the first through-holes 2151 a may be fixed bythermal fusion or using an adhesive member, such as epoxy.

In addition, as shown in FIGS. 26 and 27, the upper support protrusion2113 may be provided in a plural number. The distance between the uppersupport protrusions 2113 may be approximately set within a range capableof avoiding interference with peripheral parts. That is, the uppersupport protrusions 2113 may be arranged at uniform intervals in thestate in which the upper support protrusions 2113 are symmetricallyarranged about the center of the bobbin 2110. Alternatively, the uppersupport protrusions may be arranged symmetrically with respect to aspecific imaginary line passing through the center of the bobbin 2110,although the distance between the upper support protrusions is notuniform.

As shown in FIG. 30, the lower support protrusions 2114 may each have acylindrical or prismatic shape, like the upper support protrusions 2113.The lower support protrusions 2114 may fix an inner frame 2161 of thelower elastic member 2160 and the bobbin 2110 by coupling.

For example, the inner frame 2161 of the lower elastic member 2160 maybe provided at portions thereof corresponding to the lower supportprotrusions 2114 with second through-holes 2161 a. The lower supportprotrusions 2114 and the second through-holes 2161 a may be fixed bythermal fusion or using an adhesive member, such as epoxy. In addition,as shown in FIG. 30, the lower support protrusions 2114 may be providedin a plural number. The distance between the lower support protrusions2114 may be approximately set within a range capable of avoidinginterference with peripheral parts. That is, the lower supportprotrusions 2114 may be arranged at uniform intervals in a state inwhich the lower support protrusions 2114 are symmetrically arrangedabout the center of the bobbin 2110.

Meanwhile, the number of the lower support protrusions 2114 may be lessthan that of the upper support protrusions 2113. This is based on theshapes of the upper elastic member 2150 and the lower elastic member2160.

As shown in FIG. 27, the upper elastic member 2150 is divided into twoparts, which are electrically separated from each other to function asterminals for supplying current to the first coil 2120. For this reason,a sufficient number of upper support protrusions 2113 is provided inorder to inhibit incomplete coupling between the upper elastic member2150 and the bobbin 2110.

Meanwhile, as shown in FIG. 29, the lower elastic member 2160 is asingle body. Consequently, stable coupling between the lower elasticmember 2160 and the bobbin 2110 is achieved even using a smaller numberof lower support protrusions 2114 than the number of upper supportprotrusions 2113. Alternatively, the lower elastic member 2160 may bedivided into two parts, which are electrically separated from each otherto function as terminals for supplying current to the first coil 2120.In this case, the upper elastic member 2150 may be a single body.

In addition, two winding protrusions 2115 may be provided at the upperouter circumference of the bobbin 2110. Two opposite ends of the firstcoil 2120 may be wound around the winding protrusions 2115. The twoopposite ends of the first coil 2120 disposed on the winding protrusions2115 may be electrically connected to a pair of solder portions 2157provided at the upper elastic member 2150 by soldering. In addition, apair of winding protrusions 2115 may be arranged symmetrically withrespect to the center of the bobbin 2110. The soldering between thesolder portions 2157 and the first coil 2120 wound around the windingprotrusions 2115 may also function to securely couple the inner frame2151 of the upper elastic member 2150 and the upper surface of thebobbin 2110 to each other to inhibit incomplete coupling therebetween.In addition, a catching projection 2115 a may be formed at the end ofeach of the winding protrusions 2115 in order to inhibit separation ofthe two opposite ends of the wound first coil 2120.

The first coil 2120 may be a coil block having a ring shape, which canbe fitted onto the outer circumference of the bobbin 2110. However, thedisclosure is not limited thereto. The first coil may be directly woundaround the outer circumferential surface of the bobbin 2110.

For example, as shown in FIG. 25, the first coil 2120 may have anapproximately octagonal shape, which corresponds to the shape of theouter circumference of the bobbin 2110. The bobbin 2110 may also have anoctagonal shape. In addition, at least four sides of the first coil 2120may be straight, and corners connected between the respective sides maybe round or straight. Each straight portion of the bobbin 2110 maycorrespond to the magnet 2130. In addition, the surface of the magnet2130 corresponding to the first coil 2120 may have the same curvature asthe first coil 2120. That is, in the case in which the first coil 2120is straight, the surface of the corresponding magnet 2130 may bestraight. In the case in which the first coil 2120 is curved, thesurface of the corresponding magnet 2130 may be curved. In addition,even in the case in which the first coil 2120 is curved, the surface ofthe corresponding magnet 2130 may be straight and vice versa.

The first coil 2120 moves the bobbin 2110 in the direction parallel tothe optical axis to perform the auto focusing function. When current issupplied to the first coil 2120, the first coil 2120 may be movedtogether with the bobbin 2110 by electromagnetic interaction with themagnet 2130.

Meanwhile, the first coil 2120 may be configured to correspond to themagnet 2130. As illustrated, in the case in which the magnet 2130 is asingle body such that the entirety of the surface of the magnet 2130facing the first coil 2120 has the same polarity, the first coil 2120may also be configured such that the surface of the first coil 2120facing the magnet 2130 has the same polarity.

On the other hand, although not illustrated, in the case in which themagnet 2130 is divided into two parts by surfaces perpendicular to theoptical axis, and therefore the surface of the magnet 2130 facing thefirst coil 2120 is divided into two or more surfaces, the first coil2120 may also be divided into a number of parts corresponding to thenumber of the divided magnets 2130.

The magnet 2130 may be mounted at a position corresponding to the firstcoil 2120.

For example, the magnet 2130 may be mounted at a portion of the housing2140 that corresponds to the first coil 2120 disposed on the bobbin2110.

The magnet 2130 may be a single body. One surface of the magnet 2130facing the first coil 2120 may have an N pole, and the other surface ofthe magnet 2130 may have an S pole. However, the disclosure is notlimited thereto. The opposite configuration is also possible. Inaddition, the magnet 2130 may be divided into two parts by surfacesperpendicular to the optical axis.

At least two magnets 2130 may be mounted. According to this embodiment,four magnets 2130 may be mounted. Each of the magnets 2130 may be formedin the shape of a rectangular parallelepiped having a constant width andmay be mounted to the housing 2140 such that a wide surface of each ofthe magnets 2130 is attached to a corresponding side surface of thehousing 2140. At this time, the magnets 2130 that face each other may bearranged parallel to each other.

In addition, each magnet 2130 may be arranged so as to face the firstcoil 2120. At this time, the facing surfaces of the magnet 2130 and thefirst coil 2120 may be straight and parallel to each other. However, thedisclosure is not limited thereto. Depending on the design, one of themagnet 2130 and the first coil 2120 may be straight, and the other maybe curved. Alternatively, both the facing surfaces of the first coil2120 and the magnet 2130 may be curved. At this time, the facingsurfaces of the first coil 2120 and the magnet 2130 may have the samecurvature.

For example, in the case in which each magnet 2130 has a hexahedralshape, one pair of magnets 2130 may be arranged parallel to each otherin the second direction, and another pair of magnets 2130 may bearranged parallel to each other in the third direction. With thisarrangement structure, movement of the housing 2140 may be controlledfor optical image stabilization.

The housing 2140 may have an approximately quadrangular shape. Accordingto this embodiment, as shown in FIG. 28, the housing 2140 may have anapproximately octagonal shape. At this time, the housing 2140 mayinclude a first side portion 2141 and a second side portion 2142.

The first side portion 2141 may be a portion at which the magnet 2130 ismounted, and the second side portion 2142 may be a portion at which thesupport member 2220 is disposed.

The first side portion 2141 may be flat. According to this embodiment,the first side portion 2141 may be formed to have an area equal to orgreater than that of the magnet 2130. At this time, the magnet 2130 maybe fixed to a magnet seat portion 2141 a formed at the inside of thefirst side portion 2141. The magnet seat portion 2141 a may be a recesscorresponding to the size of the magnet 2130. The magnet seat portion2141 a may face at least four surfaces of the magnet 2130. At this time,an opening 2141 b may be formed in the bottom surface of the magnet seatportion 2141 a, i.e. the surface of the housing 2140 facing the secondcoil 2230, such that the bottom surface of the magnet 2130 disposed inthe housing 2140 directly faces the second coil 2230. Meanwhile, themagnet 2130 may be fixed to the magnet seat portion 2141 a using anadhesive. However, the disclosure is not limited thereto. The magnet2130 may be fixed to the magnet seat portion 2141 a using an adhesivemember, such as a piece of double-sided tape. Alternatively, the magnetseat portion 2141 a may be formed as a mounting hole having a windowshape, in which a portion of the magnet 2130 is inserted or exposed,instead of the recess shown in FIG. 28. Meanwhile, the first sideportion 2141 may be provided at the top surface thereof with an adhesiveinjection hole 2141 c, through which an adhesive member, such as epoxy,for fixing the magnet 2130 is injected. According to this embodiment,the adhesive injection hole 2141 c may have a tapered cylindrical shape,and an adhesive may be injected through the exposed top surface of thehousing 2140.

A plurality of third stoppers 2143 may be disposed at the top surface ofthe housing 2140. At this time, the third stoppers 2143 may be referredto as upper stoppers. The third stoppers 2143 may inhibit collisionbetween the cover member 2300 and the housing 2140. Specifically, thethird stoppers 2143 may inhibit the top surface of the housing 2140 fromdirectly colliding with the inside of the cover member 300 when anexternal impact is applied to the lens driving apparatus. In addition,the third stoppers 2143 may also function to guide the mounting positionof the upper elastic member 2150. To this end, as shown in FIG. 26, theupper elastic member 2150 may be provided with guide recesses 2155, eachof which has a shape corresponding to the shape of each third stopper2143.

Meanwhile, the first side portion 2141 may be parallel to the sidesurface of the cover member 2300. In addition, the first side portion2141 may have a larger size than the second side portion 2142.

In addition, as shown in FIGS. 28 and 29, the second side portion 2142may have therein an escape recess 2142 a having a predetermined depth.At this time, the bottom surface of the escape recess 2142 a may be opento inhibit interference between the fixing portion of the lower portionof the support member 2220 and the housing 2140. In addition, steps 2142b may be formed at the upper side of the escape recess 2142 a to supportthe inside of the upper portion of the support member 2220.

In addition, a plurality of upper frame support protrusions 2144, towhich the outer frame 2152 of the upper elastic member 2150 is coupled,may be protrudingly formed at the upper side of the housing 2140.

At this time, the number of the upper frame support protrusions 2144 maybe greater than that of the upper support protrusions 2113. This isbecause the length of the outer frame 2152 is greater than that of theinner frame 2151. Meanwhile, the outer frame 2152 may be provided withthird through-holes 2152 a corresponding to the upper frame supportprotrusions 2144. The upper frame support protrusions 2144 may be fixedin the third through-holes 2152 a using an adhesive or by thermalfusion.

In addition, a plurality of lower frame support protrusions 2145, towhich the outer frame 2162 of the lower elastic member 2160 is coupled,may be protrudingly formed at the lower side of the housing 2140. Atthis time, the number of the lower frame support protrusions 2145 may begreater than that of the lower support protrusions 2114. This is becausethe length of the outer frame 2162 of the lower elastic member 2160 isgreater than that of the inner frame 2161. Meanwhile, the outer frame2162 of the lower elastic member 2160 may be provided with fourththrough-holes 2162 a corresponding to the lower frame supportprotrusions 2145. The lower frame support protrusions 2145 may be fixedin the fourth through-holes 2162 a using an adhesive or by thermalfusion.

In addition, a fourth stopper 2147 may protrude from the bottom surfaceof the housing 2140. At this time, the fourth stopper 2147 may bereferred to as a lower stopper. The fourth stopper 2147 may inhibit thebottom surface of the housing 2140 from colliding with the base 2210and/or the circuit board 2150. In addition, in an initial state orduring normal operation, the fourth stopper 2147 may remain spaced apartfrom the base 2210 and/or the circuit board 2150 by a predetermineddistance. As a result, the housing 2140 may be spaced apart from thebase 2210 and the cover member 2300 such that the height of the housing2140 in the optical-axis direction can be maintained by the supportmember 2220 without interference from above or below. Consequently, thehousing 2140 may perform a shifting operation in the second directionand the third direction, which are a forward-and-backward direction anda left-and-right direction, respectively, in a plane perpendicular tothe optical axis.

Meanwhile, when the bobbin 2110 moves upwards and/or downwards in thedirection parallel to the optical axis, the bobbin 2110 may beelastically supported by the upper and lower elastic members 2150 and2160. Each of the upper elastic member 2150 and the lower elastic member2160 may be a leaf spring.

As shown in FIGS. 26 and 30, the upper and lower elastic members 2150and 2160 may include inner frames 2151 and 2161 coupled to the bobbin2110, outer frames 2152 and 2162 coupled to the housing 2140, andconnection portions 2153 and 2163 for connecting the inner frames 2151and 2161 and the outer frames 2152 and 2162 to each other, respectively.

The connection portions 2153 and 2163 may be bent at least once to forma predetermined pattern. The upward and/or downward movement of thebobbin 2110 in the first direction may be elastically supported by thechange in position and minute deformation of the connection portions2153 and 2163.

According to this embodiment, as shown in FIG. 32, the upper elasticmember 2150 may be divided into a first upper elastic member 2150 a anda second upper elastic member 2150 b. Through this two-divisionstructure, power having different polarities may be supplied to thefirst upper elastic member 2150 a and the second upper elastic member2150 b.

That is, as shown in FIGS. 26 and 31, the inner frame 2151 of each ofthe first and second upper elastic members 2150 a and 2150 b may beprovided at one end thereof with a solder portion 2157. The solderportion 2157 may be disposed at a position corresponding to a respectiveone of the winding protrusions 2115, around which the two oppositeportions of the first coil 2120 are wound.

The solder portion 2157 and the first coil 2120 may be electricallyconnected to each other via conductive connection such as soldering.Power may be supplied to the first coil 2120 through the first andsecond upper elastic members 2150 a and 2150 b.

Referring to FIG. 31, at least two cutting pieces 2154 may be providedat the outer frame 2152 of the upper elastic member 2150 of FIG. 31. Theupper elastic member 2150 shown in FIG. 31 is assembled with the housing2140 and the bobbin 2110, and subsequently the cutting pieces 2154 arecut out, whereby the upper elastic member 2150 shown in FIG. 31 can bedivided into two parts, namely the first and second upper elasticmembers 2150 a and 2150 b shown in FIG. 32.

At this time, the two opposite ends 2154 a and 2154 b of each cuttingpiece 2154 may each have a width that is smaller than the width of theouter frame 2152 so as to be easily cut.

In the case in which the width of each of the two opposite ends 2154 aand 2154 b of each cutting piece 2154 is smaller than the width of theouter frame 2152, a worker can visually and clearly check the positionsto be cut of the outer frame 2152 of the upper elastic member 2150, andthus can perform a cutting process more conveniently using a cuttingtool. Alternatively, unlike this embodiment, a first upper elasticmember and a second upper elastic member may be manufactured separately,without forming the cutting pieces 2154, and may be individually coupledto the bobbin 2110 and the housing 2140.

Meanwhile, according to this embodiment, as shown in FIG. 31, supportmembers 2220 may be formed integrally with the corners of the upperelastic member 2150, and may be bent in a direction parallel to theoptical axis before or after the assembly. However, the disclosure isnot limited thereto. The support members 2220 may be formed separatelyfrom the upper elastic member 2150 and may be coupled thereto. Inaddition, in the case in which the support members 2220 are formedseparately, each of the support members 2220 may be embodied by a leafspring, a coil spring, or a suspension wire. Any member capable ofrealizing elastic support may be used.

The upper and lower elastic members 2150 and 2160 may be assembled withthe bobbin 2110 and the housing 2140 by thermal fusion and/or bondingusing an adhesive. At this time, depending on the assembly order, thefixing operation may be completed by bonding using an adhesive afterthermal fusion.

For example, in the case in which the bobbin 2110 and the inner frame2161 of the lower elastic member 2160 are assembled first, and thehousing 2140 and the outer frame 2162 of the lower elastic member 2160are assembled second, the lower support protrusions 2114 of the bobbin2110, the second through-holes 2161 a coupled to the lower supportprotrusions 2114 of the bobbin 2110, and the fourth through-holes 2162 acoupled to the lower frame support protrusions 2145 of the housing 2140may be fixed by thermal fusion.

In the case in which the bobbin 2110 and the inner frame 2151 of theupper elastic member 2150 are assembled third, the upper supportprotrusions 2113 of the bobbin 2110 and the first through-holes 2151 acoupled thereto may be fixed by thermal fusion.

Thereafter, in the case in which the housing 2140 and the outer frame2152 of the upper elastic member 2150 are fixed fourth, the thirdthrough-holes 2152 a coupled to the upper frame support protrusions 2144of the housing 2140 may be bonded using an adhesive member, such asepoxy. However, the assembly order may be changed. For example, thermalfusion may be performed at the first to third assembly processes, andbonding may be performed at the fourth fixing process. Thermal fusionmay cause deformation, such as twisting. For this reason, bonding may beperformed at the final step.

In particular, since the upper elastic member 2150 is divided into twoparts, the number of the upper support protrusions 2113 may be set to begreater than that of the lower support protrusions 2114 so as to inhibitincomplete coupling, which may be caused in the case in which the upperelastic member 2150 is divided into several parts.

The second lens driving apparatus 2200, which functions as the opticalimage stabilizer, may include a first lens driving apparatus 2100, abase 2210, a support member 2220, a second coil 2230, and a positionsensor 2240, and may further include a circuit board 2250.

The first lens driving apparatus 2100 may have the same configuration asdescribed above. However, the first lens driving apparatus 2100 may bereplaced by an optical system having an auto focusing function differentfrom the above configuration.

For example, the first lens driving apparatus 2100 may be constituted byan optical module using a single lens moving actuator or a reflectiveindex variable type actuator instead of using a voice coil motor typeauto focusing actuator. That is, any optical actuator capable ofperforming an auto focusing function may be used as the first lensdriving apparatus 2100. However, it is necessary to mount the magnet2130 at a position corresponding to the second coil 2230.

As shown in FIGS. 34 to 37, the base 2210 may have an approximatelyquadrangular shape, and the support member 2220 may be fixed to each offour corners of the base 2210. The base 2210 may be provided with aplurality of first recesses 2211, through which an adhesive is injectedto fix the cover member 2300. At least one first recess 2211 may beformed in the side surface of the base 2210 that does not face aterminal surface 2250 a of the circuit board 2250.

The base 2210 may be provided at a side surface thereof facing theterminal surface 2250 a with a terminal surface support recess 2210 ahaving a size corresponding to the terminal surface 2250 a. The terminalsurface support recess 2210 a may be depressed inwards from the outercircumference of the base 2210 by a predetermined depth in order toinhibit the terminal surface 2250 a from protruding outwards oradjusting the protruding length of the terminal surface 2250 a.

In addition, steps 2210 b may be formed at the circumference of the base2210. The steps 2210 b may be coupled to the end of the cover member2300 in surface contact therewith, and may guide the cover member 2300.At this time, the steps 2210 b and the end of the cover member 2300 maybe fixed and sealed using an adhesive.

A plurality of guide protrusions 2212 may protrude from the top surfaceof the base 2210. The guide protrusions 2212 may include a first guideprotrusion 2212 a and/or a second guide protrusion 2212 b. The firstand/or second guide protrusions 2212 a and 2212 b may be arranged invarious manners according to a design. The first guide protrusion 2212a, which is disposed at an inner position, may guide the mountingposition of the circuit board 2250, and the second guide protrusion 2212b may guide the inner circumferential surface of the second coil 2230.

According to this embodiment, four second coils 2230 are provided.Therefore, eight first guide protrusions 212 a and eight second guideprotrusions 212 b may be provided. That is, four pairs of first guideprotrusions 212 a and four pairs of second guide protrusions 2212 b mayguide the circuit board 2250 and the second coil 2230. Alternatively,depending on the design, a single first guide protrusion 2212 a and asingle second guide protrusion 2212 b may be formed to guide the circuitboard 2250 and/or the second coil 2230.

In addition, the base 2210 may be provided at the edge of the topsurface thereof with support member seat recesses 2214, into which thesupport members 2220 are inserted. An adhesive may be applied to thesupport member seat recesses 2214 to fix the support members 2220 sothat the support members 2220 cannot move. The ends of the supportmembers 2220 may be inserted and fixed in the support member seatrecesses 2214.

In addition, the base 2210 may be provided at the top surface thereofwith a position sensor seat recess 2215 in which the position sensor2240 is disposed. According to this embodiment, two position sensor seatrecesses 2215 may be provided, and the position sensor 2240 may bedisposed in each position sensor seat recess 2215 to sense movement ofthe first lens driving apparatus 2100 in the second and thirddirections. To this end, for example, the two position sensor seatrecesses 2215 may be arranged such that an angle between imaginary linesinterconnecting the position sensor seat recesses 2215 and the center ofthe base 2210 is 90 degrees.

At least one surface of each position sensor seat recess 2215 may beprovided with an inclined surface 2215 a that is tapered such that epoxycan be easily injected to assemble the position sensor 2240. Inaddition, no epoxy may be injected into each position sensor seat recess2215 although epoxy is injected to fix the position sensor 2240. Theposition sensor seat recesses 2215 may be disposed at the center or nearthe center of the second coil 2230. Alternatively, the center of thesecond coil 2230 may be aligned with that of the position sensor 2240.

In addition, as shown in FIG. 37, the base 2210 may be provided at thebottom surface thereof with a seat portion at which a filter is mounted.The filter may be an infrared cut off filter. However, the disclosure isnot limited thereto. The base 2210 may be provided at the lower portionthereof with an additional sensor holder at which the filter isdisposed. In addition, a sensor board having an image sensor mountedthereon may be coupled to the bottom surface of the base 2210 toconstitute a camera module, which will be described later.

Referring to FIGS. 31 and 33, the support members 2220, which are formedintegrally with four corners of the upper elastic member 2150, may bebent, and may be coupled to the base 2210 in the assembly process. Theends of the support members 2220 may be inserted into the support memberseat recesses 2214 and may be fixed using an adhesive member, such asepoxy.

According to this embodiment, four support members 2220 may be providedso as to be disposed at the corners of the upper elastic member 2150.However, the disclosure is not limited thereto. Eight support membersmay be provided such that two support members are disposed at eachcorner of the upper elastic member.

The support members 2220 according to the embodiment may each include aconnection portion 2221, elastic deformation portions 2222 and 2223, afixing portion 2224, and a damping connection portion 2225. At least twoof the four support members 2220 may each include a terminal portion2226.

The connection portion 2221 may be connected to the upper elastic member2150, and may be provided at the center thereof with a through-hole 2221a. The bending process may be performed with respect to the left andright portions of the through-hole 2221 a in the connection portion2221, whereby the process of bending the support member 2220 shown inFIG. 31 may be performed using a small amount of force. In addition, theshape of the connection portion 2221 is not limited to the shape shownin FIG. 31. Even if the through-hole 2221 a is not provided, any shapecapable of being bent may be used. In addition, for example, in the casein which the support member 2220 is formed separately from the upperelastic member 2150, the connection portion 2221 may be a portion atwhich the support member 2220 and the upper elastic member 2150 areelectrically connected to each other.

The elastic deformation portions 2222 and 2223 may be bent at least onceto form a predetermined pattern.

According to this embodiment, the elastic deformation portions 2222 and2223 may include first and second elastic deformation portions 2222 and2223 connected to each other and a damping connection portion 2225connected to a portion at which the first and second elastic deformationportions 2222 and 2223 are connected to each other. For example, thefirst and second elastic deformation portions 2222 and 2223 maycorrespond to each other, or may be symmetric with respect to theportion at which the first and second elastic deformation portions 2222and 2223 are connected to each other.

For example, as shown in FIG. 33, in the case in which the first elasticdeformation portion 2222 is bent four times into an N shape havingstraight portions formed in a direction parallel to the optical axis,the second elastic deformation portion 2223 may have a shapecorresponding to that of the first elastic deformation portion 2222. TheN shape is merely illustrative, and the first and second elasticdeformation portions may have various other patterns, e.g. a zigzagshape. For example, the first and second elastic deformation portions2222 and 2223 may be integrated into a single elastic deformationportion. Alternatively, the first and second elastic deformationportions 2222 and 2223 may be configured in the form of a suspensionwire having no pattern.

When the housing 2140 moves in the second and third directionsperpendicular to the optical axis, the elastic deformation portions 2222and 2223 may be minutely elastically deformed in the direction in whichthe housing 2140 moves. As a result, the housing 2140 may movesubstantially in the second and third directions perpendicular to theoptical axis with little change in position of the housing 2140 in thefirst direction parallel to the optical axis, thereby improving theaccuracy of optical image stabilization. This is based on the propertiesof the elastic deformation portions 2222 and 2223, which extend in thelongitudinal direction.

The fixing portion 2224 may be provided at the end of the support member2220. In addition, the fixing portion 2224 may be formed in a plateshape having a larger width than the elastic deformation portions 2222and 2223. However, the disclosure is not limited thereto. The fixingportion 2224 may have a width equal to or less than that of the elasticdeformation portions 2222 and 2223.

The fixing portion 2224 may be inserted into the support member seatrecess 2214 of the base 2210, and may be fixed to the base 2210 using anadhesive member, such as epoxy. However, the disclosure is not limitedthereto. The fixing portion 2224 may be fitted into the support memberseat recess 2214.

The damping connection portion 2225 may be disposed at a portion withwhich the first and second elastic deformation portions 2222 and 2223are in contact. The end of the damping connection portion 2225 may bedisposed in a space defined by a partition wall 2227 of the housing2140. In addition, the damping connection portion 2225 may be located ata region of the support member 2220 that is located between theconnection portion 2221 and the fixing portion 2224.

As shown in FIG. 33, the space may include three surfaces, namely anouter side surface of the second side portion 2142 of the housing 2140,a partition wall 2227 protruding from the outer side surface of thesecond side portion 2142, and a bottom surface located under thepartition wall 2227. Silicon S for damping may be applied to the dampingconnection portion 2225 disposed in the space.

At this time, in order to inhibit silicon S from flowing down, silicon Smay be applied in the state in which the housing 2140 is tilted suchthat the three surfaces of the space are oriented downwards. Inaddition, silicon S is made to remain a gel state, whereby the dampingconnection portion 2225 is not completely fixed. Therefore, the dampingconnection portion 2225 may move minutely according to movement of theelastic deformation portions 2222 and 2223. Minute vibration transferredvia the elastic deformation portions 2222 and 2223, may be absorbed inthe damping connection portion 2225 having silicon S applied thereto.

According to this embodiment, the end of the damping connection portion2225 may have a hook shape. The hook-shaped end of the dampingconnection portion 2225 may be caught by the partition wall 2227.However, the disclosure is not limited thereto. The end of the dampingconnection portion 2225 may be straight, and may be disposed in thespace.

Meanwhile, the upper elastic member 2150 may be divided into two parts,namely the first and second upper elastic members 2150 a and 2150 b, towhich power having different polarities is supplied. Consequently,terminals 2226 for supplying power may be provided at the first andsecond upper elastic members 2150 a and 2150 b. The terminals 2226 maybe provided at two of the four support members 2220, since positive (+)power or negative (−) power may be applied to the terminals 2226.

As shown in FIG. 33, the terminal 2226 may have the shape of a platethat extends from the fixing portion 2224, and may be bent at leastonce. The terminal 2226 may be electrically connected to a pad 2256provided at the circuit board 2250 by a method such as soldering. Tothis end, the terminal 2226 of the support member 2220 and the pad 2256of the circuit board 2250 may be arranged such that the surface of theterminal 2226 and the surface of the pad 2256 face each other. At thistime, the terminal 2226 of the support member 2220 and the pad 2256 ofthe circuit board 2250 may be in surface contact with each other.Alternatively, as illustrated, the terminal 2226 of the support member2220 and the pad 2256 of the circuit board 2250 may be spaced apart fromeach other by a predetermined distance, and a conductive member such assolder may be interposed therebetween. Through the coupling between theterminal 2226 of the support member 2220 and the pad 2256 of the circuitboard 2250, the support member 2220 can supply power having differentpolarities to the first and second upper elastic members 2150 a and 2150b, and can increase the fixing force between the support member 2220 andthe base 2210.

The second coil 2230 may be disposed so as to face the magnet 2130,which is fixed to the housing 2140. In an example, the second coil 2230may be disposed outside the magnet 2130. Alternatively, the second coil2230 may be disposed under the magnet 2130 so as to be spaced apart fromthe magnet by a predetermined distance.

According to this embodiment, the second coil 2230 includes two secondcoils for the second direction, which face each other, and two secondcoils for the third direction, which face each other. However, thedisclosure is not limited thereto. Two second coils, namely one secondcoil for the second direction and one second coil for the thirddirection may be provided. Alternatively, four or more second coils maybe provided.

In addition, the second coil 2230 may be configured by winding a wire ina donut shape. As shown in FIG. 36, a start portion 2231 and an endportion 2232 of the second coil may be electrically connected to theterminals 2252 provided at the circuit board 2250.

The second coil 2230 may be mounted to the top surface of the circuitboard 2250, which is disposed on the base 2210. However, the disclosureis not limited thereto. The second coil 2230 may be in close contactwith the base 2210 or may be spaced apart from the base 2210 by apredetermined distance. Alternatively, the second coil 2230 may beprovided at an additional board, which is disposed on the circuit board2250. According to this embodiment, the mounting position of the secondcoil 2230 may be guided by first and second guide protrusions 2215 a and2215 b, which protrude from the top surface of the base 2210.

The position sensor 2240 may be disposed at the center of the secondcoil 2230 to sense movement of the housing 2140. The position sensor2240 may be constituted by a Hall sensor. However, any sensor capable ofsensing a change in magnetic force may be used.

As shown in FIGS. 35 and 40, the position sensor 2240 may be mounted tothe bottom surface of the circuit board 2250. The position sensor 2240mounted to the bottom surface of the circuit board 2250 may be insertedinto the position sensor seat recess 2215 formed in the base 2210. Thebottom surface of the circuit board 2250 may be a surface that isopposite the surface on which the second coil 2230 is disposed.

The circuit board 2250 may be disposed on or coupled to the top surfaceof the base 2210. The mounting position of the circuit board 2250 may beguided by the first guide protrusion 2212 a. The circuit board 2250 maybe provided with at least one bent terminal surface 2250 a. According tothis embodiment, the circuit board 2250 may be provided with two bentterminal surfaces 2250 a. A plurality of terminals 2251 may be disposedat the terminal surfaces 2250 a in order to receive external power andto supply current to the first and second coils 2120 and 2230. Thenumber of the terminals 2251 disposed at the terminal surfaces 2250 amay be increased or decreased based on the kinds of components to becontrolled. Meanwhile, according to this embodiment, the circuit board2250 may be an FPCB. However, the disclosure is not limited thereto. Theterminals of the circuit board 2250 may be directly formed at thesurface of the base 2210 using a surface electrode method.

In addition, the circuit board 2250 may be provided with an escaperecess 2254, through which one of the start portion 2231 and the endportion 2232 of the second coil 2230 passes. The escape recess 2254 mayform a space, through which one of the start portion 2231 and the endportion 2232 of the second coil 2230 that is withdrawn from the bottomsurface of the second coil 2230 passes. The bottom surface of the secondcoil 2230 may be a surface that is in contact with the circuit board2250.

As shown in FIG. 36, any one of the start portion 2231 and the endportion 2232 of the second coil 2230 may be withdrawn from the bottomsurface of the second coil 2230. In the case in which the start portion2231 is withdrawn from the outer circumferential surface of the secondcoil 2230, the end portion 2232 may be withdrawn from the innercircumferential surface of the second coil 2230. At this time, the endportion 2232 is also withdrawn from the bottom surface of the secondcoil 2230. Thus, when the end portion 2232 is withdrawn from the innercircumferential surface of the second coil 2230 to the outside, the endportion 2232 must pass through the bottom surface of the second coil2230. However, if the end portion 2232 is withdrawn from the bottomsurface of the second coil 2230, the second coil 2230 may not beinstalled horizontally due to the thickness of the end portion.Therefore, the escape recess 2254 is formed in a predetermined shape inthe circuit board 250 such that the entire bottom surface of the secondcoil 2230 is in surface contact with the entire surface of the mountingposition. A space having a thickness corresponding to the escape recess2254 is formed in the bottom surface near the end of the second coil2230. As a result, the end portion 2232 passes through the space and canbe withdrawn outside the second coil 2230.

The circuit board 2250 may be provided at corners thereof with pads2256, which are electrically connected to the terminals 2226 provided atthe support members 2220. The pads 2256 may be disposed on the topsurfaces of the corners of the circuit board 2250, may be formed of aconductive material, and may be connected to an electric circuit (notshown) in the circuit board 250. Two withdrawn portions of the firstcoil 2120 may be connected to each of the pads 2256. Meanwhile, the pads2256 may be provided at two corners of the circuit board 2250, and nopads may be provided at the two other corners of the circuit board 2250.The corners, at which the pads 2256 are not provided, may each have anangular shape, but may each have a chamfered shape, as shown in FIG. 35.

Meanwhile, the position sensor 2240 may be aligned with the center ofthe second coil 2230, with the circuit board 2250 interposedtherebetween. That is, the position sensor 2240 is not directlyconnected to the second coil 2230. The second coil 2230 may be disposedon the top surface of the circuit board 2250, and the position sensor2240 may be disposed on the bottom surface of the circuit board 2250.According to this embodiment, the position sensor 2240, the second coil2230 and the magnet 2130 may be arranged in the same axis or may bealigned with each other. However, the disclosure is not limited thereto.

Through the above configuration, the second coil 2230 moves the housing2140 in the second and third directions via interaction with the magnet2130, thereby performing hand tremor compensation.

The cover member 2300 may have approximately a box shape so as tocontain the first and second lens driving apparatuses 2100 and 2200. Atthis time, as shown in FIG. 24, the cover member 2300 may have a secondrecess 2310 formed at a position corresponding to the first recess 2211in the base 2100, and a concave recess having a predetermined area maybe formed by coupling of the first and second recesses 2211 and 2310.This concave recess may be coated with an adhesive member havingviscosity. That is, the adhesive member coated on the concave recess mayfill a gap defined between the facing surfaces of the cover member 2300and the base 2210 through the concave recess, and may seal a spacedefined between the cover member 2300 and the base 2210, which arecoupled to each other.

In addition, the cover member 2300 may be provided at a side platethereof with a third recess 2320 in order to avoid interference with theterminals 2251 provided on the terminal surface 2250 a of the circuitboard 2250.

The third recess 2320 may be depressed in the side plate of the covermember 2300 that faces the terminal surface 2250 a, and an adhesivemember may be supplied into the third recess 2320 in order to seal aspace defined between the cover member 2300 and the base 2210 and aspace defined between the cover member 2230 and the circuit board 2250.

Meanwhile, the first to third recesses 2211, 2310 and 2320 may be formedin both the base 2210 and the cover member 2300. However, the disclosureis not limited thereto. The first to third recesses 2211, 2310 and 2320may be formed in only the base 2210 or only the cover member 2300 in asimilar manner.

Since the first and second lens driving apparatuses 2100 and 2200 canachieve the auto focusing operation and the hand tremor compensationoperation using the magnet 2130 in common, the embodiment is capable ofreducing the number of parts and of improving responsiveness by reducingthe weight of the housing 2140. Needless to say, a magnet for autofocusing and a magnet for hand tremor compensation may be providedseparately from each other.

In addition, since the support member 2220 and the upper elastic member2150 can be formed in a body or can be formed integrally with eachother, the embodiment is capable of reducing the number of parts and ofimproving assembly efficiency.

In addition, since external minute vibration transferred to the supportmember 2220 can be absorbed using silicon S, the embodiment is capableof realizing hand tremor compensation control more precisely.

The lens driving apparatus 300 according to the embodiment may furtherinclude a sensing coil 2400, first and second current supply units 2412and 2414, and a voltage sensing unit 2420.

The sensing coil 2400 may be arranged in the housing 2140. The sensingcoil 2400 may be disposed around the upper end of the outercircumferential surface of the housing 2140. The sensing coil 2400 maybe disposed along the upper end of the outer circumferential surface ofthe housing 2140. Alternatively, the sensing coil 2400 may be insertedand fixed into a coil receiving recess 2148 formed in the outercircumferential surface of the housing 2140. The sensing coil 2400 maybe directly wound around the coil receiving recess 2148 depressedinwards from the outer circumferential surface of the housing 2140.

The coil receiving recess 2148 may be located at the upper portion ofthe housing 2140 in order to avoid overlapping the magnet 2130, locatedin the housing 2140, in the horizontal direction. The sensing coil 2400may take the form of, for example, a closed loop. However, thedisclosure is not limited thereto.

The sensing coil 2400 may be spaced apart from the first coil 2120.Through this configuration, when power is supplied to the first coil2120, induced voltage may be generated at the sensing coil 2400. Thevoltage induced to the sensing coil 2400 may vary according to thedistance between the sensing coil 2400 and the first coil 2120. That is,the voltage induced to the sensing coil 2400 is variable. In thisembodiment, based on the above characteristics, it is possible to sensethe movement and/or the position of the bobbin 2110 by measuring thevoltage induced to the sensing coil 2400. The movement and/or theposition of the bobbin 110 sensed in this way may be used for the autofocusing feedback function.

The sensing coil 2400 may be electrically connected to the circuit board2250. At this time, the sensing coil 2400 may be electrically connectedto the circuit board 2250 via the upper elastic member 2150 and thesupport member 2220.

In an example, the upper elastic member 2150 may be divided into four ormore parts. At this time, two divided upper elastic members may beelectrically connected to the sensing coil 2400, and two other upperelastic members may be electrically connected to the first coil 2120.

That is, the sensing coil 2400 and the first coil 2120 may beelectrically connected to the circuit board 2250 via the divided upperelastic members.

The sensing coil 2400 may be located so as to avoid overlapping thefirst coil 2120 in the horizontal direction. Meanwhile, the sensing coil2400 may be located so as to avoid overlapping the magnet 2130 in thehorizontal direction. That is, the sensing coil 2400 may be disposed soas to avoid overlapping the first coil 2120 and the magnet 2130 in adirection perpendicular to the optical axis, thereby minimizing theinfluence of the sensing coil 2400 on electromagnetic interactionbetween the first coil 2120 and the magnet 2130.

The second current supply unit 2414 may supply impulse current to thefirst coil 2120. For example, the second current supply unit 2414 maysupply high-frequency current such as impulse current to the first coil2120. For example, the high-frequency current supplied to the first coil2120 may induce voltage to the sensing coil 2400 without influencing themovement of the bobbin 2110.

That is, the second current supply unit 2414 may supply impulse currentto the first coil 2120, whereby induced voltage may be generated at thesensing coil 2400 without influencing the auto focusing operation of thebobbin 2110. The current supply unit 2412 may supply high-frequencycurrent to the first coil 2120 at a predetermined interval orperiodically.

The voltage sensing unit 2420 may sense the voltage induced to thesensing coil 2400 and may transmit the result of sensing voltage to thecontroller 2430 of the optical device. The controller 2430 of theoptical device may determine the position of the bobbin 2110 based onthe sensed voltage transmitted thereto.

FIG. 41 illustrates a Driver IC 2410 for supplying current to the firstcoil 2120. The Driver IC 2410 may include a first current supply unit2412 for supplying drive current to the first coil 2120 and a secondcurrent supply unit 2414 for supplying high-frequency current such asimpulse current to the first coil 2120 in order to cause the sensingcoil 2400 to generate induced voltage.

That is, when drive current and high-frequency current are supplied tothe first coil 2120 via the Driver IC 2410, the bobbin 2110 may movetogether with the first coil 2120, and voltage may be induced to thesensing coil 2400 according to the movement of the bobbin 2100.

The voltage induced to the sensing coil 2400 may be sensed by thevoltage sensing unit 2420 and may be transmitted to the controller 2430of the optical device. The controller 2430 of the optical device maycalculate the position of the bobbin 2110 and may determine whether toperform additional movement of the bobbin 2110. These processes may becarried out in real time and may be referred to as an auto focusingfeedback function.

Hereinafter, the operation of the camera module according to theembodiment will be described.

First, the auto focusing function of the camera module according to theembodiment will be described. When power is supplied to the first coil2120, the first coil 2120 is moved by electromagnetic interactionbetween the first coil 2120 and the magnet 2130. At this time, thebobbin 2110, to which the first coil 2120 is coupled, is moved togetherwith the first coil 2120. That is, the bobbin 2110, in which the lensmodule is coupled, moves in the vertical direction with respect to thehousing 2140.

The movement of the bobbin 2110 causes the lens module to move close toor away from the image sensor. That is, the focus on a subject isadjusted.

Meanwhile, in order to realize the auto focusing function of the cameramodule according to the embodiment more precisely, the auto focusingfeedback may be applied. Voltage is induced to the sensing coil 2400mounted in the housing 2140 by the high-frequency current supplied tothe first coil 2120. Meanwhile, when drive current is supplied to thefirst coil 2120 and thus the bobbin 2110 moves relative to the housing2140, the magnitude of the voltage that is induced to the sensing coil2400 may vary. At this time, high-frequency current may be supplied tothe first coil 2120 at a predetermined interval. The voltage sensingunit 2420 senses the voltage that is induced to the sensing coil 2400and transmits the sensed voltage to the controller 2430 of the opticaldevice. The controller 2430 of the optical device determines whether toperform additional movement of the bobbin 2110 based on the voltagetransmitted thereto from the voltage sensing unit 2420. Since theseprocesses are performed in real time, the auto focusing function of thecamera module according to the embodiment may be realized more preciselyvia the auto focusing feedback.

The hand tremor compensation function of the camera module according tothe embodiment will now be described. When power is supplied to thesecond coil 2230, the magnet 2130 may be moved by electromagneticinteraction between the second coil 2230 and the magnet 2130, and thehousing 2140, in which the magnet 2130 is coupled, may be moved togetherwith the magnet 2130. That is, the housing 2140 may move in thehorizontal direction with respect to the base 2210.

Meanwhile, the housing 2140 may be caused to be tilted with respect tothe base 2210. Through this movement of the housing 2140, the lensmodule moves with respect to the image sensor in a direction (adirection perpendicular to the optical axis of the lens module) that isparallel to the direction in which the image sensor is oriented, therebyrealizing the hand tremor compensation function.

Meanwhile, in order to realize the hand tremor compensation function ofthe camera module according to the embodiment more precisely, the handtremor compensation feedback may be applied. A pair of position sensors2240, which is mounted on the base 2210 and is constituted by a Hallsensor, senses a magnetic field of the magnet 2130, which is fixed tothe housing 2140. When the housing 2140 moves relative to the base 2210,the intensity of the magnetic field that is sensed by the positionsensors 2240 varies. The position sensors 2240 sense the movement of thehousing 2140 in the horizontal direction (the x-axis direction and they-axis direction) or the position of the housing 2140 in theabove-described way, and transmit the sensed value to the controller,e.g. the controller 2430 of the optical device shown in FIG. 41.

The controller determines whether to perform additional movement of thehousing 2140 based on the sensed value transmitted thereto. Since theseprocesses are performed in real time, the hand tremor compensationfunction of the camera module according to the embodiment may berealized more precisely via the hand tremor compensation feedback.

Hereinafter, the assembly order of the lens driving apparatus 300according to the embodiment will be described.

First, the housing 2140 having the sensing coil 2400 wound thereon andthe magnet 2130 are bonded to each other. Subsequently, an adhesive isapplied to the top surface of the base 2210, and the position sensor2240, the second coil 2230 and the circuit board 250 are assembledthereon.

Subsequently, the lower elastic member 2160 for the auto focusingoperation is assembled to the lower portion of the bobbin 2110 and thelower portion of the housing 2140. Subsequently, the upper elasticmember 2150 for the auto focusing operation and the hand tremorcompensation operation is assembled to the upper portion of the bobbin2110 and the upper portion of the housing 2140. Subsequently, the bobbin2110 and the housing 2140 are placed on the base 2210 so as to havecorrect central locations and heights, and the support members 220formed integrally with the upper elastic member 2150 are bent and arefixed to the base 2210. Subsequently, the cover member 2300 is assembledwith the base 2210, thereby completing the assembly of the lens drivingapparatus.

Hereinafter, the camera module according to the embodiment will bedescribed.

The camera module may include a lens driving apparatus, a lens module,an infrared cut off filter, a printed circuit Board, an image sensor,and a controller.

The lens module may include one or more lenses (not shown), and a lensbarrel configured to accommodate one or more lenses. However, oneconfiguration of the lens module is not limited to a lens barrel, andany holder construction configured to hold one or more lenses may bepossible. The lens module may move along with the lens driving apparatusby being coupled to the lens driving apparatus. The lens module may becoupled to the inside of the lens driving apparatus, for example. Thelens module may be screw-engaged with the lens driving apparatus, forexample. The lens module may be coupled to the lens driving apparatususing an adhesive (not shown), for example. Meantime, light havingpassed through the lens module may be emitted to the image sensor.

The infrared cut off filter can cut off light of an infrared areaincident on the image sensor. The infrared cut off filter may bepositioned between the lens module and the image sensor, for example.The infrared cut off filter may be positioned at a holder member (notshown) formed separately from the base. However, the infrared cut offfilter may be mounted in a through-hole formed at the center portion ofthe base. The infrared cut off filter may be formed of a film materialor glass material, for example. Meanwhile, the infrared cut off filtermay be formed by coating a plate-type optical filter, such as an imagingsurface protecting cover glass or a cover glass, with an infrared cutoff coating material.

The printed circuit board may support the lens driving apparatus. Theprinted circuit board may be mounted with an image sensor. By way ofexample, the printed circuit board may be mounted at an upper inner sidewith an image sensor and at an upper outside with a sensor holder (notshown). The sensor holder may be positioned at an upper side with a lensdriving apparatus. Furthermore, the printed circuit board may bepositioned at an upper outside with a lens driving apparatus and at anupper inside with an image sensor. Through this configuration, lighthaving passed through the lens module accommodated inside the lensdriving apparatus may be emitted to the image sensor mounted at theprinted circuit board. The printed circuit board may supply power to thelens driving apparatus. Meanwhile, the printed circuit board may beprovided with a controller for controlling the lens driving apparatus.

The image sensor may be mounted on the printed circuit board. The imagesensor may be positioned so as to allow an optical axis to be alignedwith the lens module, whereby the image sensor may obtain light havingpassed through the lens module. The image sensor may output an imageusing light emitted thereto. The image sensor may be a charge coupleddevice (CCD), a metal oxide semi-conductor (MOS), a CPD or a CID, forexample. However, the kinds of image sensor are not limited thereto.

The controller may be mounted on the printed circuit board. Thecontroller may be positioned at an outside of the lens drivingapparatus. However, the controller may be positioned at an inside of thelens driving apparatus. The controller may control a direction,intensity and amplitude of current supplied to each component of thelens driving apparatus. The controller may perform at least one of anauto focusing function and a hand tremor compensation function of thecamera module by controlling the lens driving apparatus. That is, thecontroller may move the lens module in the optical-axis direction or ina direction perpendicular to the optical-axis direction or may tilt thelens module by controlling the lens driving apparatus. Furthermore, thecontroller may perform feedback control with respect to the autofocusing function and the hand tremor compensation function.

FIG. 42 is an exploded perspective view illustrating a camera module1200 according to an embodiment.

Referring to FIG. 42, the camera module 1200 may include a lens barrel400, a lens driving apparatus 100, 200 or 300, a filter 610, an imagesensor 810, a sensor 820, a controller 830, and a connector 840.

The camera module 1200 may further include an adhesive member 612, afirst holder 600, and a second holder 800.

The lens barrel 400 may be mounted in a bobbin 110 of the lens drivingapparatus 100, 200 or 300. The lens driving apparatus 100, 200 or 300may be the embodiment shown in FIG. 1, 14 or 24.

The first holder 600 may be located under the base 210 or 1210 of thelens driving apparatus 100 or 200. The filter 610 may be mounted on thefirst holder 600, and the first holder 600 may have a protruding portion500 on which the filter 610 is seated.

The adhesive member 612 may couple or attach the base 210 or 1210 of thelens driving apparatus 100 or 200 to the first holder 600. In additionto the attachment function described above, the adhesive member 612 mayserve to inhibit foreign matter from entering the lens driving apparatus100, 200 or 300.

For example, the adhesive member 612 may be epoxy, a thermosettingadhesive, or an ultraviolet-curable adhesive.

The filter 610 may serve to inhibit light within a specific frequencyband having passed through the lens barrel 400 from being introducedinto the image sensor 810. The filter 610 may be an infrared cut offfilter. However, the disclosure is not limited thereto. At this time,the filter 610 may be oriented parallel to the x-y plane.

A region of the first holder 600 in which the filter 610 is mounted maybe provided with a hollow to allow the light having passed through thefilter 610 to be introduced into the image sensor 810.

The second holder 800 may be disposed under the first holder 600, andthe image sensor 810 may be mounted on the second holder 600. The lighthaving passed through the filter 610 is introduced into the image sensor810 so as to form an image on the image sensor 810.

The second holder 800 may include various circuits, devices, and acontroller in order to convert the image, formed on the image sensor810, into electrical signals to thereby transmit the same to an externaldevice.

The second holder 800 may take the form of a circuit board on which theimage sensor may be mounted, a circuit pattern may be formed, andvarious devices are coupled.

The image sensor 810 may receive an image included in light introducedthrough the lens driving apparatus 100 or 200, and may convert thereceived image into electrical signals.

The filter 610 and the image sensor 810 may be spaced apart from eachother so as to be opposite to each other in the first direction.

The sensor 820 may be mounted on the second holder 800, and may beelectrically connected to the hand tremor controller 830 through thecircuit pattern formed on the second holder 800.

The sensor 820 may be a device capable of sensing movement of the cameramodule 1200. For example, the sensor 820 may take the form of a motionsensor, a dual-axis or triple-axis gyro sensor, an angular speed sensor,an acceleration sensor, or a gravity sensor.

The controller 830 controls the operation of the lens driving apparatus100, 200 or 300. The controller 830 may include at least one of an AFfeedback controller for performing an AF feedback operation or an OISfeedback controller for performing OIS feedback control.

The controller 830 may be mounted on the second holder 800.

The AF feedback controller may be electrically connected to the firstcoil 120, 1120 or 2100 and the second coil 170, 1170 or 2400 of the lensdriving apparatus 100, 200 or 300.

The AF feedback controller may supply the first drive signal Id1 to thefirst coil 120, 1120 or 2120 and may supply the second drive signal Id2to the second coil 170, 1170 or 2400.

The AF feedback controller may perform AF feedback control with respectto displacement of the movable unit in response to the result of sensingthe displacement of the movable unit based on the first induced voltageV1 of the first induction coil 1171 and the voltage V2 of the secondinduction coil.

In addition, the OIS feedback controller may be electrically connectedto the position sensors 240 a and 240 b and the third coils 1230 a to1230 d. The OIS feedback controller may perform OIS feedback controlwith respect to the OIS movable unit in response to the result ofsensing displacement of the OIS movable unit based on signals suppliedfrom the position sensors 240 a and 240 b. At this time, the OIS movableunit may include the AF movable unit and components mounted in thehousing 1140.

The connector 840 may be electrically connected to the second holder 800and may be provided with a port for electrical connection with anexternal device.

In order to remove PWM noise, unlike the embodiment in which a capacitoris added to the circuit board 250 of FIG. 1 or the circuit board 1250 ofFIG. 14, a capacitor, which is connected in parallel to the second coil170 or 1170, may be provided at the second holder 800 of the cameramodule.

In addition, the lens driving apparatus 100, 200 or 300 according to theembodiment may be included in an optical instrument, which forms animage of an object present in a space using reflection, refraction,absorption, interference, and diffraction of light, which increasesvisibility, which records and reproduces an image via a lens, or whichperforms optical measurement or propagation or transmission of images.For example, the optical instrument according to the embodiment may beany one of a mobile phone, a smartphone, a portable smart device, adigital camera, a laptop computer, a digital broadcasting terminal, aPersonal Digital Assistant (PDA), a Portable Multimedia Player (PMP),and a navigation device, but not limited hereto. Any kind of device forcapturing a picture or motion picture may be possible.

FIG. 43 is a perspective view illustrating a mobile terminal 200Aaccording to an embodiment, and FIG. 44 is a view illustrating theconstitution of the mobile terminal shown in FIG. 43.

Referring to FIGS. 43 and 44, the mobile terminal 200A (hereinafter,referred to as a “terminal”) may include a body 850, a wirelesscommunication unit 710, an A/V input unit 720, a sensing unit 740, aninput/output unit 750, a memory unit 760, an interface unit 770, acontroller 780, and a power supply unit 790.

The body 850 shown in FIG. 43 has a bar shape. However, the disclosureis not limited thereto. The body may be any of various types such as,for example, a slide type, a folder type, a swing type, or a swivel typein which two or more sub-bodies are coupled so as to be movable relativeto each other.

The body 850 may include a case (e.g. casing, housing, or cover)defining the external appearance of the terminal. For example, the body850 may be divided into a front case 851 and a rear case 852. A varietyof electronic components of the terminal may be mounted in the spacedefined between the front case 851 and the rear case 852.

The wireless communication unit 710 may include one or more modules,which enable wireless communication between the terminal 200A and awireless communication system or between the terminal 200A and a networkin which the terminal 200A is located. For example, the wirelesscommunication unit 710 may include a broadcast receiving module 711, amobile communication module 712, a wireless Internet module 713, a nearfield communication module 714, and a location information module 715.

The Audio/Video (A/V) input unit 720 serves to input audio signals orvideo signals, and may include a camera 721 and a microphone 722.

The camera 721 may include the camera module 1200 according to theembodiment shown in FIG. 42.

The sensing unit 740 may sense the current state of the terminal 200Asuch as, for example, the opening or closing of the terminal 200A, thelocation of the terminal 200A, the presence of user touch, theorientation of the terminal 200A, or the acceleration/deceleration ofthe terminal 200A, and may generate a sensing signal to control theoperation of the terminal 200A. For example, when the terminal 200A is aslide type phone, the sensing unit may sense whether the slide typephone is opened or closed. In addition, the sensing unit serves to sensewhether power is supplied from the power supply unit 790, or whether theinterface unit 770 is coupled to an external device.

The input/output unit 750 serves to generate visual, audible, or tactileinput or output. The input/output unit 750 may generate input data tocontrol the operation of the terminal 200A, and may display informationprocessed in the terminal 200A.

The input/output unit 750 may include a keypad unit 730, a displaymodule 751, a sound output module 752, and a touchscreen panel 753. Thekeypad unit 730 may generate input data in response to input to akeypad.

The display module 751 may include a plurality of pixels, the color ofwhich varies in response to electrical signals. For example, the displaymodule 751 may include at least one of a liquid crystal display, thinfilm transistor-liquid crystal display, organic light-emitting diodedisplay, flexible display, or 3D display.

The sound output module 752 may output audio data received from thewireless communication unit 710 in, for example, a call signal receivingmode, a call mode, a recording mode, a voice recognition mode, or abroadcast receiving mode, or may output audio data stored in the memoryunit 760.

The touchscreen panel 753 may convert variation in capacitance, causedby a user touch to a specific touchscreen region, into electrical inputsignals.

The memory unit 760 may store programs for the processing and control ofthe controller 780, and may temporarily store input/output data (e.g. aphone book, messages, audio, still images, pictures, and moving images).For example, the memory unit 760 may store images captured by the camera721, for example, pictures or moving images.

The interface unit 770 serves as a passage for connection between theterminal 200A and an external device. The interface unit 770 may receivepower or data from the external device and transmit the same torespective constituent elements inside the terminal 200A, or maytransmit data inside the terminal 200A to the external device. Forexample, the interface unit 770 may include a wired/wireless headsetport, an external charger port, a wired/wireless data port, a memorycard port, a port for connection of a device having an identificationmodule, an audio input/output (I/O) port, a video I/O port, and anearphone port.

The controller 780 may control the general operation of the terminal200A. For example, the controller 780 may perform control and processingrelated to voice call, data communication, and video call.

The controller 780 may include a multimedia module 781 for multimediaplayback. The multimedia module 781 may be provided inside thecontroller 780, or may be provided separately from the controller 780.

The controller 780 may perform pattern recognition processing by whichwriting input or drawing input to a touchscreen is perceivable ascharacters and images respectively.

The power supply unit 790 may supply power required to operate therespective constituent elements upon receiving external power orinternal power under the control of the controller 780.

The features, structures and effects described in association with theembodiments above are incorporated into at least one embodiment of thepresent invention, but are not limited only to the one embodiment.Furthermore, the features, structures and effects exemplified inassociation with respective embodiments can be implemented in otherembodiments by combination or modification by those skilled in the art.Therefore, contents related to such combinations and modificationsshould be construed as falling within the scope of the presentinvention.

INDUSTRIAL APPLICABILITY

Embodiments may be used for a lens driving apparatus capable ofachieving accurate auto focusing by inhibiting a lens from beingdefocused due to variation in ambient temperature, and for a cameramodule and an optical device.

1. A lens moving apparatus comprising: a housing; a bobbin disposed inthe housing; a first coil disposed on the bobbin; a magnet disposed onthe housing; an second coil disposed on the housing and comprising afirst induction coil and a second induction coil; and a circuit boarddisposed under the first coil and electrically connected to the secondcoil, wherein the first coil is configured to receive a first signalthrough the circuit board, wherein the second coil is configured toreceive a second signal through the circuit board, wherein the circuitboard is configured to receive a first voltage from the first inductioncoil and a second voltage from the second induction coil.
 2. The lensmoving apparatus according to claim 1, wherein the first voltage isgenerated by mutual induction between the first coil and the firstinduction coil, and the second voltage comprises a third voltagegenerated based on mutual induction between the first coil and thesecond induction coil and a fourth voltage which is a voltage dropcaused by the second signal.
 3. The lens moving apparatus according toclaim 1, wherein each of the first and second induction coils surroundsan outer circumferential surface of the housing so as to rotate about anoptical axis in a clockwise direction or in a counterclockwisedirection.
 4. The lens moving apparatus according to claim 1, whereinone of the first and second induction coils surrounds an outercircumferential surface of the housing so as to rotate about an opticalaxis in a clockwise direction or in a counterclockwise direction, andthe other one of the first and second induction coils is disposed on aside surface of the housing in a shape of a coil ring that is woundabout an axis perpendicular to the optical axis in the clockwisedirection or in the counterclockwise direction.
 5. The lens movingapparatus according to claim 1, wherein each of the first signal and thesecond signal is one of an alternating-current signal and a pulsesignal.
 6. The lens moving apparatus according to claim 1, wherein eachof the first signal and the second signal comprises a pulse widthmodulation (PWM) signal.
 7. The lens moving apparatus according to claim1, wherein the first induction coil and the second induction coil areconnected in series to each other, and wherein an intermediate tap isprovided at a contact point between one end of the first induction coiland one end of the second induction coil and the intermediate tapreceives ground power.
 8. The lens moving apparatus according to claim1, wherein the first induction coil and the second induction coil areelectrically separated from each other.
 9. The lens moving apparatusaccording to claim 1, comprising: an upper elastic member coupled to anupper portion of the bobbin and an upper portion of the housing; a lowerelastic member coupled to a lower portion of the bobbin and a lowerportion of the housing; a third coil disposed opposite to the magnet tomove the housing via interaction with the magnet; and a support memberconnecting the upper elastic member and the circuit board, wherein eachof the upper elastic member and the lower elastic member is divided intotwo or more parts, wherein the first coil is electrically connected totwo selected from among the divided parts of the upper elastic member,and wherein the second coil is electrically connected to at least threeselected from among parts of the upper elastic member other than theselected parts of the upper elastic member and among the parts of thelower elastic member.
 10. The lens moving apparatus according to claim9, wherein the circuit board is disposed on one side surface of thehousing and electrically connected to the divided parts of the upperelastic member and the divided parts of the lower elastic member. 11.The lens moving apparatus according to claim 9, wherein the circuitboard is disposed below the lower elastic member and electricallyconnected to the divided parts of the upper elastic member and thedivided parts of the lower elastic member; and the support membercomprises a plurality of support members electrically connect thedivided parts of the upper elastic member and the circuit board to eachother.
 12. The lens moving apparatus according to claim 1, comprising: acapacitor connected in parallel to both ends of the second coil.
 13. Thelens moving apparatus according to claim 2, wherein the first and thirdvoltages vary according to variation in ambient temperature.
 14. Thelens moving apparatus according to claim 13, wherein the first and thirdvoltages are identically influenced by the variation in ambienttemperature.
 15. The lens moving apparatus according to claim 1, whereinthe circuit board comprises a first terminal connected to the firstinduction coil and a second terminal connected to the second inductionterminal.
 16. A camera module comprising: a lens; a lens movingapparatus according to claim 1 for moving the lens; and an image sensorfor converting an image incident through the lens moving apparatus intoan electrical signal.
 17. An optical device comprising: a camera moduleaccording to claim 16; and a controller for controlling operation of thecamera module, wherein the controller is configured to receive the firstvoltage and the second voltage and detects a difference between thefirst voltage and the second voltage, wherein the controller isconfigured to detect ambient temperature or variation in ambienttemperature based on the difference between the first voltage and thesecond voltage.
 18. The optical device according to claim 17, whereinthe controller is configured to set code value corresponding to adisplacement of the bobbin, and wherein the controller is configured tocompensate for the code value based on the detected ambient temperatureor the detected variation in ambient temperature.
 19. The optical deviceaccording to claim 17, wherein the detected variation in ambienttemperature is a difference between the detected temperature and a roomtemperature.
 20. The optical device according to claim 17, wherein thecontroller is configured to compensate for the code value based on avariation in a focal length of the lens according to the detectedvariation in ambient temperature.